TY  - BOOK
AU  - Vygodsky,     .
ED  - Vygodsky                                                                                                                                                                                                                                                       . 
TI  - Mathematical hand book : higher mathematics / 
U1  - 028.7151 
PY  - 1975///
CY  - Moscow : 
PB  - Mir publishers , 
ER  -