@article{articlece069cdb,
title   = {High spatial resolution spectroscopy of W51 IRS 2E and IRS 2W: two very massive young stars in early formation stages},
author = {Barbosa, Cássio L and Blum, Robert D and Conti, Peter S and Damineli Neto, Augusto and Figuerêdo, Elysandra},
year = {2008},
journal   = {The Astrophysical Journal}
}