@article{CMUC_1988_29_3_a14,
     author = {Pudl\'ak, Pavel},
     title = {On a unification problem related to {Kreisel's} conjecture},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {551--556},
     year = {1988},
     volume = {29},
     number = {3},
     mrnumber = {972836},
     zbl = {0664.03037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1988_29_3_a14/}
}