Raziskovalno delo

===Some papers===
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* Y.Y. Feng, J. Kozak, On the generalized Euler-Frobenius polynomial. J. approx. theory, 1981, let. 32, št. 4, pp. 327-338.
* Y.Y. Feng, J. Kozak, L [sub] [infinity] -lower bound of L [sub] 2-projections onto splines on a geometric mesh. J. approx. theory, 1982, let. 35, št. 1, pp. 64-76. 
* J. Kozak, Shape preserving approximation. Comput. Ind., 7 (1986), pp. 435-440.
* Y.Y. Feng, J. Kozak, An approach to the interpolation of nonuniformly spaced data, J. Comput. Appl. Math., 23 (1988), pp. 169-178.
* Y.Y. Feng, J. Kozak, The convexity of families of adjoint patches for a Bézier triangular surface. J. Comput. Math., 1991, let. 9, št. 4, pp. 301-304. 
* Y.Y. Feng, J. Kozak, Asymptotic expansion formula for Bernstein polynomials defined on a simplex. Constr. approx., 1992, let. 8, pp. 49-58. 
* Y.Y. Feng, J. Kozak, Cutting corners preserves Lipschitz continuity. Gao-xiao yingyong shuxue xuebao, 1994, let. 9, št. 1, pp. 31-34. 
* F.L. Chen, J. Kozak, The intersection of a triangular Bézier patch and a plane. J. Comput. Math., 1994, let. 12, št. 2, pp. 138-146.
* Y.Y. Feng, J. Kozak, On convexity and Schoenberg's variation diminishing splines. Zhongguo Kexue Jishu Daxue xueb., 1994, let. 24, št. 2, pp. 129-134. 
* J. Kozak, On the choice of the exterior knots in the B-spline basis. Zhongguo Kexue Jishu Daxue xueb., 1995, let. 25, št. 2, pp. 172-177.
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* Y.Y. Feng, J. Kozak, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/G2/G2.pdf On G_2 continuous interpolatory composite quadratic Bézier curves], J. Comput. Appl. Math., 72 (1996), pp. 141-159.
* Y.Y. Feng, J. Kozak, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/BBPPOL/BBPOL.pdf The theorem on the B-B polynomials defined on a simplex in the blossoming form], J. Comput. Math., 14 (1996), pp. 64-70. 
* F.L. Chen, J. Kozak, On computing zeros of a bivariate Bernstein polynomial, J. Comput. Math., 14 (1996), pp. 237-248.
* Y.Y. Feng, J. Kozak, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/GG/GG.pdf On G_2 continuous cubic spline interpolation], BIT Numerical Mathematics, 27 (1997), pp. 312-332. '''Acknowledgement'''. The original publication is available at [http://www.springerlink.com www.springerlink.com] as [http://www.springerlink.com/content/c4364v87x776472k/ http://www.springerlink.com/content/c4364v87x776472k/]
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* F.L. Chen, Y.Y. Feng, J. Kozak, Tracing a planar algebraic curve. Gao-xiao yingyong shuxue xuebao, 12B (1997), pp. 15-24.
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* Z.B. Chen, Y.Y. Feng, J. Kozak, The blossom approach to the dimension of the bivariate spline space. J. Comput. Math., 18 (2000),  pp. 183-198. 
* J.S. Deng, Y.Y. Feng, J. Kozak, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/Diener/DengFengKozak.pdf A note on the dimension of the bivariate spline space over the Morgan-Scott tringulation], SIAM  J. Numer. Anal., 37 (2000), pp. 1021-1028. 
* F. Forstnerič, J. Kozak, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/Franci/Handles7Orig01022003.pdf Strongly pseudoconvex handlebodies], J. Korean Math. Soc., 40 (2003), pp. 727-745. 
* J. Kozak, E. Žagar, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/G2InR3/ginter-revised-last.pdf On geometric interpolation by polynomial curves], SIAM J. Numer. Anal., 42 (2004), pp. 953-967. '''Acknowledgement'''. The original publication is available at [http://epubs.siam.org/sam-bin/dbq/article/42207 http://epubs.siam.org/sam-bin/dbq/article/42207]
* J. Kozak, M. Krajnc, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/MarjetaCubicPolynomial/cubicGI_last-rev.pdf Geometric interpolation by planar cubic polynomial curves], Comput. Aided Geom. Des., 24 (2007),  pp. 67-78. '''Acknowledgement'''. The original publication is available at [http://dx.doi.org/10.1016/j.cagd.2006.11.002 http://dx.doi.org/10.1016/j.cagd.2006.11.002]
* G. Jaklič, J. Kozak,, M. Krajnc, E. Žagar, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/CircleLikeCurves/GCI-last-rev-2.pdf On geometric interpolation of circle-like curves], Comput. Aided Geom. Des., 24 (2007),  pp. 241-251. '''Acknowledgement'''. The original publication is available at [http://dx.doi.org/10.1016/j.cagd.2007.03.002 http://dx.doi.org/10.1016/j.cagd.2007.03.002] 
* G. Jaklič, J. Kozak, M. Krajnc, E. Žagar, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/GeometricCurveInterpolation/GIR2-accepted.pdf On geometric interpolation by planar parametric polynomial curves], Math. Comput., 76 (2007),  pp. 1981-1993. '''Acknowledgement'''. The original publication is available at [http://www.ams.org/mcom/2007-76-260/S0025-5718-07-01988-6/home.html  http://www.ams.org/mcom/2007-76-260/S0025-5718-07-01988-6/home.html]
* J. Kozak, M. Krajnc, [http://www.fmf.uni-lj.si/~kozak/RaziskovalnoDelo/NekateriClanki/MarjetaKubicniZlepek/G1Spline_Last.pdf Geometric interpolation by planar cubic G^1 splines], BIT Numerical Mathematics, ?(2007), pp. ?-?+16. '''Acknowledgement'''. The original publication is available at [http://www.springerlink.com www.springerlink.com] as [http://www.springerlink.com/content/x2v8982642360680/ http://www.springerlink.com/content/x2v8982642360680/]