@article{MAN_1979__243_182797,
     author = {Erik Christensen},
     title = {Subalgebras of a {Finite} {Algebra.}},
     journal = {Mathematische Annalen},
     pages = {17--30},
     publisher = {mathdoc},
     volume = {243},
     year = {1979},
     zbl = {0393.46049},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__243_182797/}
}