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@article{AM2_1980__21_182419, author = {P.G. Laird}, title = {A reconsideration of the}, journal = {Aequationes mathematicae}, pages = {98--104}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0456.39005}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182419/} }
P.G. Laird. A reconsideration of the. Aequationes mathematicae, Tome 21 (1980), pp. 98-104. http://geodesic.mathdoc.fr/item/AM2_1980__21_182419/