@article{10_4153_CMB_1964_055_7,
     author = {Lambek, Joachim},
     title = {Goursat's {Theorem} and {Homological} {Algebra}},
     journal = {Canadian mathematical bulletin},
     pages = {597--608},
     year = {1964},
     volume = {7},
     number = {4},
     doi = {10.4153/CMB-1964-055-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-055-7/}
}