TY  - BOOK
AU  - Boltyansky,V.G.
TI  - Differentiation explained / 
T2  - Little mathematics library
U1  - 515.35 
PY  - 1977///
CY  - Moscow
PB  - Mir, 
KW  - Mathematics
KW  - Oscillations
KW  - Geometry
KW  - Differential equations
ER  -