TY  - BOOK
AU  - Coddington, Earl A,
AU  - Levinson, N. ,
TI  - Theory of ordinary differential equations /​
T2  - International series in pure and applied mathematics
SN  - 9780070992566
U1  - 515.352 COD (3) 
PY  - 1955///
CY  - New Delhi
PB  - Tata McGraw Hill Education
N1  - Bibliography: p. 417 - 422.
ER  -