PREGALACTIC HELIUM ABUNDANCE AND ABUNDANCE GRADIENTS ACROSS OUR GALAXY FROM PLANETARYNEBULAE
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UNIV NACL AUTONOMA MEXICO,INST ASTRON,MEXICO CITY,MEXICO
UNIV PADOVA,OSSERV ASTROFIS,I-36012 ASIAGO,ITALIA
UNIV PADOVA,OSSERV ASTROFIS,I-36012 ASIAGO,ITALIA
