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@article{IM_1989__95_3_143660, author = {Gary Lawlor}, title = {The angle criterion.}, journal = {Inventiones mathematicae}, pages = {437--446}, publisher = {mathdoc}, volume = {95}, number = {3}, year = {1989}, zbl = {0662.49018}, url = {http://geodesic.mathdoc.fr/item/IM_1989__95_3_143660/} }
Gary Lawlor. The angle criterion.. Inventiones mathematicae, Tome 95 (1989) no. 3, pp. 437-446. http://geodesic.mathdoc.fr/item/IM_1989__95_3_143660/