Searching for massive pre-stellar cores through observations of N$_\mathsf{2}$H$^{+}$ and N$_\mathsf{2}$D$^{+}$

E-ISSN： 1432-0746|460|3|709-720

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.460, Iss.3, 2006-12, pp. : 709-720

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