The multiplicity of massive stars in the Orion Nebula Cluster as seen with long-baseline interferometryR. Grellmann, T. Preibisch, T. Ratzka, S. Kraus, K. G. Helminiak and H. ZinneckerA&A, 550 (2013) A82DOI: https://doi.org/10.1051/0004-6361/201220192