@article{JLT_1994_4_1_a1,
     author = {J. D. Lawson},
     title = {Maximal {Ol'shanskii} {Semigroups}},
     journal = {Journal of Lie theory},
     pages = {017--03},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/JLT_1994_4_1_a1/}
}