@Article{ DEL_RODRÍGUEZ:3691-3699,

author = { AURORA INÉS DEL RÍO CABEZA and ANTONIO M. RODRÍGUEZ GARZÓN } ,

title = { ON H^1 OF CATEGORICAL GROUPS },

journal = { Communications in Algebra },

year = { 2006 },

volume = { 34 },

pages = { 3691-3699 },

}