B fields in OB stars (BOB): The discovery of a magnetic field in a multiple system in the Trifid nebula, one of the youngest star forming regions
S. Hubrig, L. Fossati, T. A. Carroll, N. Castro, J. F. González, I. Ilyin, N. Przybilla, M. Schöller, L. M. Oskinova, T. Morel, N. Langer, R. D. Scholz, N. V. Kharchenko, M.-F. Nieva and the BOB collaboration
