@article{10_1017_S0017089500008673,
     author = {Beazer, R.},
     title = {Some p-algebras and double p-algebras having only principal congruences},
     journal = {Glasgow mathematical journal},
     pages = {157--164},
     year = {1992},
     volume = {34},
     number = {2},
     doi = {10.1017/S0017089500008673},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008673/}
}