@article{CMJ_1997__47_2_a7,
     author = {Barbour, Graham D. and Raftery, James G.},
     title = {On the degrees of permutability of subregular varieties},
     journal = {Czechoslovak Mathematical Journal},
     pages = {317--325},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1997},
     mrnumber = {1452422},
     zbl = {0927.08001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_1997__47_2_a7/}
}