TY  - BOOK
AU  - Byerly, William Elwood
TI  - Introduction to the calculus of variations
U1  - 517.4 
PY  - 1928///
CY  - Cambridge
PB  - Harvard University Press
KW  - Series, Trignometric
KW  - Spherical harmonics
KW  - Zonal Harmonics
ER  -