@article{10_4153_CMB_1964_056_4,
     author = {Leicht, J. B.},
     title = {Axiomatic {Proof} of {J.} {Lambek's} {Homological} {Theorem}},
     journal = {Canadian mathematical bulletin},
     pages = {609--613},
     year = {1964},
     volume = {7},
     number = {4},
     doi = {10.4153/CMB-1964-056-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-056-4/}
}