@article{10_21136_CMJ_1965_100691,
     author = {H\'ajek, Otomar},
     title = {Characteristics of modular finite-length lattices},
     journal = {Czechoslovak Mathematical Journal},
     pages = {521--525},
     year = {1965},
     volume = {15},
     number = {4},
     doi = {10.21136/CMJ.1965.100691},
     mrnumber = {0193035},
     zbl = {0132.26101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100691/}
}