@article{10_4153_CMB_1969_016_6,
     author = {Day, Alan},
     title = {A {Characterization} of {Modularity} {forCongruence} {Lattices} of {Algebras*}},
     journal = {Canadian mathematical bulletin},
     pages = {167--173},
     year = {1969},
     volume = {12},
     number = {2},
     doi = {10.4153/CMB-1969-016-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-016-6/}
}