1. V. S. Dron’ and S. D. Ivasyshen, “On the correct solvability of the Cauchy problem for Kolmogorov-type degenerate parabolic equations,” Ukr. Mat. Visn., 1, No. 1, 61–68 (2004).
2. S. D. Ivasyshen, "Integral representation and initial values of solutions of $$ \overrightarrow{2b} $$-parabolic systems," Ukr. Mat Zh., 42, No. 4, 500-506 (1990)
3. English translation: Ukr. Math. J., 42, No. 4, 443-448 (1990)
4. S. D. Ivasyshen, “Solutions of parabolic equations from the families of Banach spaces that depend on time,” Mat. Studii, 40, No. 2, 172–181 (2013).
5. S. D. Ivasyshen and I. P. Medyns’kyi, “The classical fundamental solution of the Kolmogorov degenerate equation whose coefficients are independent of the variables of degeneration,” Bukov. Mat. Zh., 2, Nos. 2-3, 94–106 (2014).