@article{10_4153_CMB_1973_100_4,
     author = {Gr\"atzer, G. and Lakser, H.},
     title = {A {Note} on the {Implicational} {Class} {Generated} by a {Class} of {Structures}},
     journal = {Canadian mathematical bulletin},
     pages = {603--605},
     year = {1973},
     volume = {16},
     number = {4},
     doi = {10.4153/CMB-1973-100-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-100-4/}
}