@article{10_4153_CJM_1972_017_8,
     author = {Day, Alan},
     title = {Injectivity in {Equational} {Classes} of {Algebras}},
     journal = {Canadian journal of mathematics},
     pages = {209--220},
     year = {1972},
     volume = {24},
     number = {2},
     doi = {10.4153/CJM-1972-017-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-017-8/}
}