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Westbrook, W. E.; Gezari, D. Y.; Hauser, M. G.; Werner, M. W.; Elias, J. H.; Neugebauer, G.; et al. (1976). "One-millimeter continuum emission studies of four molecular clouds". Astrophysical Journal. 209: 94–101. Bibcode:1976ApJ...209...94W. doi:10.1086/154695.