@article{10_1017_S0017089500032687,
     author = {Katri\v{n}\'ak, Tibor},
     title = {Free distributive {P-algebras:} a new approach{\textdagger}},
     journal = {Glasgow mathematical journal},
     pages = {333--342},
     year = {1998},
     volume = {40},
     number = {3},
     doi = {10.1017/S0017089500032687},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032687/}
}