@article{RMH_1981_1981_1_a2,
     author = {Mart{\'\i}nez Cegarra, Antonio},
     title = {La sucesi\'on de tres t\'erminos en categor{\'\i}as algebraicas.},
     journal = {Revista matem\'atica hispano-americana},
     pages = {128-138},
     publisher = {mathdoc},
     volume = {41},
     number = {5-6},
     year = {1981},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/RMH_1981_1981_1_a2/}
}