A H2CO and H110α survey of H ii regions with the 25-m radio telescope of Nanshan Station Z. M. Du, J. J. Zhou, J. Esimbek, X. H. Han and C. P. Zhang A&A, 532 (2011) A127 Published online: 04 August 2011 DOI: 10.1051/0004-6361/201116506