NUMBER OF PLANETARYNEBULAE IN OUR GALAXY - PEIMBERT, M; CRUZ GONZALEZ, C; ALLOIN, D (UNIV NACL AUTONOMA MEXICO,INST ASTRON,MEXICO CITY 20,MEXICO, 1976)
ASTROPHYS J
Keywords: NUMBER, PLANETARY, NEBULAE, GALAXY; ASTRONOMIA Y ASTROFISICA; PLANETOLOGIA; PLANETAS