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@article{CM_1976__33_1_3_0, author = {Gorton, R.}, title = {$A$-systems}, journal = {Compositio Mathematica}, pages = {3--13}, publisher = {Noordhoff International Publishing}, volume = {33}, number = {1}, year = {1976}, mrnumber = {435264}, zbl = {0338.20091}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1976__33_1_3_0/} }
Gorton, R. $A$-systems. Compositio Mathematica, Tome 33 (1976) no. 1, pp. 3-13. http://geodesic.mathdoc.fr/item/CM_1976__33_1_3_0/