@article{GDZPPN002083841, title = {Ordered Manifolds, Invariant Cone Fields, and Semigroups.}, journal = {Forum mathematicum}, volume = {1}, year = {1989}, pages = {273-308}, zbl = {0672.53041}, url = {http://dml.mathdoc.fr/item/GDZPPN002083841} }
LAWSON, JIMMIE D. Ordered Manifolds, Invariant Cone Fields, and Semigroups.. Forum mathematicum, Tome 1 (1989) pp. 273-308. http://gdmltest.u-ga.fr/item/GDZPPN002083841/