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@article{SF_1986__35_134853, author = {J.D. Lawson}, title = {Fields of tangent sets and {Hofmann} cones.}, journal = {Semigroup forum}, pages = {1--28}, publisher = {mathdoc}, volume = {35}, year = {1986}, zbl = {0619.22007}, url = {http://geodesic.mathdoc.fr/item/SF_1986__35_134853/} }
J.D. Lawson. Fields of tangent sets and Hofmann cones.. Semigroup forum, Tome 35 (1986), pp. 1-28. http://geodesic.mathdoc.fr/item/SF_1986__35_134853/