Differential Equations and Optimal Control :  Proceedings of the Seventh Regional Scientific Session of Mathematicians held in Kalsk, September 1988 : Section Differential Equations / 
Ed. Michał Kisielewicz, Władysław Sosulski. 
 - Zielona Góra :  Higher College of Engineering,  1988. 
 - 39 s. :  il. ;  24 cm. 
<br/><br/>bibliogr. 
<br/><br/><label>Uniwersalna Klasyfikacja Dziesiętna: </label> 517.9:519.6:061.3