TY  - BOOK
AU  - Heading, J.
TI  - AN INTRODUCTION TO PHASE-INTEGRAL METHODS
U1  - 517.38 
PY  - 1962///
CY  - London
PB  - Methuen
KW  - Differential Equations, Linear. Numerical Solutions
KW  - Integrals
KW  - Mathematical Physics
ER  -