@article{CMUC_1989__30_4_a1,
     author = {Gardner, Barry J.},
     title = {How to make many-sorted algebras one-sorted},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {627--635},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1989},
     mrnumber = {1045890},
     zbl = {0693.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a1/}
}