A study of R in Galactic O stars from the 2MASS catalogueP. Patriarchi, L. Morbidelli and M. PerinottoA&A, 410 3 (2003) 905-909DOI: https://doi.org/10.1051/0004-6361:20031263
in Galactic O stars from the 2MASS catalogue in Galactic O stars from the 2MASS catalogue