@article{10_1017_S0017089500005887,
     author = {Koubek, V. and Sichler, J.},
     title = {Universal varieties of distributive double p-algebras},
     journal = {Glasgow mathematical journal},
     pages = {121--131},
     year = {1985},
     volume = {26},
     number = {2},
     doi = {10.1017/S0017089500005887},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500005887/}
}