Gaseous abundances in planetary nebulæ : What have we learned in the past five years ?
P. G. Beck,D. Salabert,R. A. Garcia,J. do Nascimento, T. S. S. Duarte,S. Mathis,C. Regulo,J. Ballot,R. Egeland,M. Castro,F. Pérez-Hernández,O. Creevey,A. Tkachenko,T. van Reeth,L. Bigot, E., Corsaro,T. Metcalfe,S. Mathur,P. L. Palle,C. Allende Prieto,D. Montes,C. Johnston, F. M., Andersen,H. van Winckel semanticscholar（2017）
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