TY  - BOOK
AU  - Sz.-Nagy, B [ed.]
AU  - Hatvani, L [ed.]
TI  - Differential equations: qualitative theory
SN  - 0444700935
U1  - 515.35 
PY  - 1987///
CY  - Amsterdam
PB  - North-Holland
KW  - Differential equations
KW  - Qualitative theory
ER  -