@article{10_4153_CJM_1969_029_2,
     author = {Wille, Rudolf},
     title = {Variety {Invariants} for {Modular} {Lattices}},
     journal = {Canadian journal of mathematics},
     pages = {279--283},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-029-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-029-2/}
}