A 0.8 mm heterodyne facility receiver for the APEX telescope C. Risacher, V. Vassilev, R. Monje, I. Lapkin, V. Belitsky, A. Pavolotsky, M. Pantaleev, P. Bergman, S.-E. Ferm, E. Sundin et al. (10 more) A&A, 454 2 (2006) L17-L20 Published online: 11 July 2006 DOI: 10.1051/0004-6361:20065373