TY  - DATA
AU  - Guillemin, Victor,
AU  - Sternberg, Shlomo,
TI  - Geometric asymptotics 
T2  - Mathematical Surveys and Monographs, 
SN  - 9780821832080 (online)
PY  - 1977///
CY  - Providence, R.I.
PB  - American Mathematical Society
KW  - Asymptotic expansions
KW  - Geometrical optics
KW  - Geometry, Differential
N1  - Includes bibliographical references and index
UR  - https://doi.org/http://dx.doi.org/10.1090/surv/014
ER  -