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@article{CMH_1984__59_139986, author = {R.V. Gurjar and A.R. Shastri}, title = {The fundamental group at infinity of affine surfaces.}, journal = {Commentarii mathematici Helvetici}, pages = {459--484}, publisher = {mathdoc}, volume = {59}, year = {1984}, zbl = {0594.14015}, url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139986/} }
R.V. Gurjar; A.R. Shastri. The fundamental group at infinity of affine surfaces.. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 459-484. http://geodesic.mathdoc.fr/item/CMH_1984__59_139986/