TY  - BOOK
AU  - Kwok, S
TI  - Cosmic butterflies : the colorful mysteries of planetary nebulae
SN  - 521791359
SN  - 68867
U1  - 523.1135 KWO 
PY  - 2001///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Planetary nebulae
N1  - Includes bibliographical references (p. [169]-170) and index
ER  -