TY - BOOK ID - 131137647 TI - Qualitative theory of differential equations AU - Nemytskii, V.V. AU - Stepanov, V.V. PY - 1972 SN - 0691080208 PB - Princeton, N. J. DB - UniCat KW - Differential equations UR - https://www.unicat.be/uniCat?func=search&query=sysid:131137647 AB - ER -