@article{CMUC_1980__21_2_a6,
     author = {Gardner, Barry J.},
     title = {Extension-closure and attainability for varieties of algebras with involution},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {285--292},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1980},
     mrnumber = {580683},
     zbl = {0437.16011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1980__21_2_a6/}
}