00747cam a2200229 4500 sa 68012002 DLC 20260227112606.0 691105s1967 ii 000 0 eng sa 68012002 PL480:I-E-9429 DLC DLC DLC QA372 .P733 1967 517/.382 Pontri͡agin, Lev Semenovich, 1908- Obyknovennye different͡sialnya uravnenii͡a. English A course in ordinary differential equations [by] L. S. Pontriagin. Delhi, Hindustan Pub. Corp. (India), 1967. x, 333 p. 25 cm. International monographs on advanced mathematics and physics Differential equations. 84239 84239