@ARTICLE{Feulner2006b, author = {{Feulner}, G. and {Hopp}, U. and {Botzler}, C.~S.}, title = "{Integrated specific star formation rates of galaxies, groups, and clusters: a continuous upper limit with stellar mass?}", journal = {Astronomy \& Astrophysics}, year = 2006, month = may, volume = 451, pages = {L13-L16}, doi = {10.1051/0004-6361:20065082}, }