Dense Molecular Gas Around Protostars and in Galactic Nuclei - European Workshop on Astronomical Molecules; Baan, Willem A.; Hagiwara, Yoshiaki; Langevelde, Huib Jan; Langevelde, Huib Jan van; van Langevelde, Huib Jan; Langevelde, Huib J. van (Dordrecht Springer Netherlands, 2005)