The little-studied cluster Berkeley 90 - I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary
J. Maíz Apellániz, I. Negueruela, R. H. Barbá, N. R. Walborn, A. Pellerin, S. Simón-Díaz, A. Sota, A. Marco, J. Alonso-Santiago, J. Sanchez Bermudez, R. C. Gamen and J. Lorenzo
A&A, 579 (2015) A108
DOI: https://doi.org/10.1051/0004-6361/201526123