Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1972__31_3_115169, author = {Porter, A. Duane}, title = {Systems of four equations with a matrix application in a finite field}, journal = {Portugaliae mathematica}, pages = {121--131}, publisher = {mathdoc}, volume = {31}, number = {3}, year = {1972}, mrnumber = {0302618}, zbl = {0243.15012}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1972__31_3_115169/} }
Porter, A. Duane. Systems of four equations with a matrix application in a finite field. Portugaliae mathematica, Tome 31 (1972) no. 3, pp. 121-131. http://geodesic.mathdoc.fr/item/PORMA_1972__31_3_115169/