@article{10_4064_sm_43_1_27_39,
     author = {J. Jankins},
     title = {Free semigroups and unitary group representations},
     journal = {Studia Mathematica},
     pages = {27--39},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1972},
     doi = {10.4064/sm-43-1-27-39},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-43-1-27-39/}
}