TY  - BOOK
AU  - Sikorski Roman
TI  - Advanced Calculus: Functions of several variables
T2  - Instytut matematyozny polskiej akademi nauk : Monogragice matematyozme; 51
U1  - B32, K9 
PY  - 1969///
CY  - Warszawa
PB  - Polish scientific        
ER  -