Determination of the far-infrared dust opacity in a prestellar core A. Suutarinen, L. K. Haikala, J. Harju, M. Juvela, Ph. André, J. M. Kirk, V. Könyves and G. J. White A&A, 555 (2013) A140 Published online: 15 July 2013 DOI: 10.1051/0004-6361/201219103