TY  - BOOK
AU  - Ahsan Akhtar
AU  - Sabiha Ahsan
TI  - Textbook of differential calculus/ 
SN  - 9788120324428
U1  - 515.3 
PY  - 2004///
CY  - Delhi
PB  - PHI learning
KW  - Differential Calculus
ER  -