@article{Malytska_2009, title={The systems of the equations of Kolmogorovâ€™s type of second oder}, volume={1}, url={https://journals.pnu.edu.ua/index.php/cmp/article/view/4013}, abstractNote={<p>We consider one class of systems of ultraparabolic equation of second order, that have four groups of variables after which are degeneration and coefficients are depend only on a time variable, we construct the fundamental matrix of Cauchy problem and obtain the estimations of this matrix and all its derivatives.</p>}, number={2}, journal={Carpathian Mathematical Publications}, author={Malytska, H.P.}, year={2009}, month={Dec.}, pages={180â€“190} }