@article{10_4153_CJM_1969_082_x,
     author = {Tymchatyn, E. D.},
     title = {A {One-Parameter} {Subsemigroup} which meets many {Regular} {-Classes}},
     journal = {Canadian journal of mathematics},
     pages = {735--739},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-082-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-082-x/}
}