@article{10_4064_cm101_2_3,
     author = {V. Koubek and J. Sichler},
     title = {Almost $ff$-universal and $q$-universal varieties
 of modular $0$-lattices},
     journal = {Colloquium Mathematicum},
     pages = {161--182},
     publisher = {mathdoc},
     volume = {101},
     number = {2},
     year = {2004},
     doi = {10.4064/cm101-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm101-2-3/}
}