TY  - BOOK
AU  - Aller,Lawrence Hugh
AU  - Wilson,O.C.
ED  - University of Michigan Observatory
TI  - Spectrophotometry of the central stars on four planetary nebulae
PY  - 1954///
CY  - [Michigan]
PB  - [s. n.]
N1  - Repr. from The Astrophysical Journal, Vol. 119, pp. 143-252, 1954
ER  -