@article{10_1017_S0017089500009976,
     author = {Koubek, V. and Sichler, J.},
     title = {On congruences of double p-algebras with nonvoid core},
     journal = {Glasgow mathematical journal},
     pages = {385--394},
     year = {1993},
     volume = {35},
     number = {3},
     doi = {10.1017/S0017089500009976},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009976/}
}