@article{MOMA_1972__76_177579,
     author = {H. Muthsam},
     title = {\"Uber die {Summe} {Markoffscher} {Ketten} auf {Halbgruppen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {43--54},
     publisher = {mathdoc},
     volume = {76},
     year = {1972},
     zbl = {0292.60099},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1972__76_177579/}
}