@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/}
}