@article{HHA_2012_14_2_a1,
     author = {Marino Gran and Zurab Janelidze and Diana Rodelo},
     title = {3 {\texttimes} 3 lemma for star-exact sequences},
     journal = {Homology, homotopy, and applications},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {2012},
     doi = {10.4310/HHA.2012.v14.n2.a1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.2012.v14.n2.a1/}
}