Chemical differentiation in regions of high-mass star formation - CS, dust, and NH+ in southern sourcesL. Pirogov, I. Zinchenko, P. Caselli and L. E. B. JohanssonA&A, 461 2 (2007) 523-535DOI: https://doi.org/10.1051/0004-6361:20054777
H+ in southern sourcesH+ in southern sources