@article{PIM_1972_N_S_14_28_a7,
     author = {S. A. Hoq},
     title = {Automorphisms {Of} {Exact} {Sequences}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {67 },
     publisher = {mathdoc},
     volume = {_N_S_14},
     number = {28},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_14_28_a7/}
}