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# Y.Y. Feng, J. Kozak, On convexity and Schoenberg's variation diminishing splines. Zhongguo Kexue Jishu Daxue xueb., 1994, let. 24, št. 2, str. 129-134. [COBISS.SI-ID 7699545] 

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# Y.Y. Feng, J. Kozak, On G [sup] 2 continuous interpolatory composite quadratic Bézier curves. J. comput. appl. math.. [Print ed.], 1996, let. 72, št. 1, str. 141-159. [COBISS.SI-ID 6573401] 

# Y.Y. Feng, J. Kozak, The theorem on the B-B polynomials defined on a simplex in the blossoming form. J. comput. math., 1996, let. 14, št. 1, str. 64-70. [COBISS.SI-ID 7700313] 

# F.L. Chen, J. Kozak, On computing zeros of a bivariate Bernstein polynomial. J. comput. math., 1996, let. 14, št. 3, str. 237-248. [COBISS.SI-ID 6665049] 

# Y.Y. Feng, J. Kozak, On G [sup] 2 continuous cubic spline interpolation. BIT (Nord. Tidskr. Inf-Behandl.), 1997, let. 37, št. 2, str. 312-332. [COBISS.SI-ID 7368025] 

# F.L. Chen, Y.Y. Feng, J. Kozak, Tracing a planar algebraic curve. Gao-xiao yingyong shuxue xuebao, 1997, let. 12B, str. 15-24. [COBISS.SI-ID 7460697] 

# Z.B. Chen, Y.Y. Feng, J. Kozak, The blossom approach to the dimension of the bivariate spline space. J. comput. math., 2000, vol. 18, no. 2, str. 183-198. [COBISS.SI-ID 9586521] 

# J.S. Deng, Y.Y. Feng, J. Kozak, A note on the dimension of the bivariate spline space over the Morgan-Scott tringulation. SIAM j. numer. anal., 2000, vol. 37, št. 2, str. 1021-1028. [COBISS.SI-ID 9766233] 

# F. Forstnerič, J. Kozak, Strongly pseudoconvex handlebodies. J. Korean Math. Soc., 2003, vol. 40, no. 4, str. 727-745. [COBISS.SI-ID 12705113] 

# J. Kozak, E. Žagar, On geometric interpolation by polynomial curves. SIAM j. numer. anal., 2004, vol. 42, no. 3, str. 953-967. http://epubs.siam.org/sam-bin/dbq/article/42207. [COBISS.SI-ID 13398617] 

# J. Kozak, KRAJNC, Marjetka. Geometric interpolation by planar cubic polynomial curves. Comput. aided geom. des.. [Print ed.], 2007, vol. 24, no. 2, str. 67-78. http://dx.doi.org/10.1016/j.cagd.2006.11.002. [COBISS.SI-ID 14227545] 

# JAKLIČ, Gašper, J. Kozak,, KRAJNC, Marjetka, ŽAGAR, Emil. On geometric interpolation of circle-like curves. Comput. aided geom. des.. [Print ed.], 2007, vol. 24, iss. 5, str. 241-251. http://dx.doi.org/10.1016/j.cagd.2007.03.002. [COBISS.SI-ID 14311513] 

# JAKLIČ, Gašper, J. Kozak, KRAJNC, Marjetka, ŽAGAR, Emil. On geometric interpolation by planar parametric polynomial curves. Math. comput., 2007, vol. 76, no. 260, str. 1981-1993. http://www.ams.org/mcom/2007-76-260/S0025-5718-07-01988-6/home.html. [COBISS.SI-ID 14340953]