TY  - BOOK
AU  - Akhtar, Ahsan
AU  - Ahsan, Sabiha
TI  - Textbook of  differential calculus
SN  - 978-81-203-3853-1
U1  - 515.33 
PY  - 2015///
PB  - PHI Learning
KW  - MATHS
N1  - 26-Nov-2018; 5546
ER  -