TY  - BOOK
AU  - Buchdahl,H.A.
TI  - An introduction to Hamiltonian optics,
T2  - Cambridge monographs on physics
SN  - 0521075165
U1  - 535/.32 
PY  - 1970///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Geometrical optics
KW  - Symmetry (Physics)
KW  - Aberration
ER  -