The $\alpha$-element abundances in the most oxygen-poor planetary nebula PNG 135.9+55.9

Publisher: Edp Sciences

E-ISSN: 1432-0746|395|3|929-941

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.395, Iss.3, 2002-12, pp. : 929-941

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