@article{SF_1970__1_133780,
     author = {J.D. Lawson and J.H. Carruth},
     title = {On the existence of one-parameter semigroups.},
     journal = {Semigroup forum},
     pages = {85--90},
     publisher = {mathdoc},
     volume = {1},
     year = {1970},
     zbl = {0197.01801},
     url = {http://geodesic.mathdoc.fr/item/SF_1970__1_133780/}
}