@article{10_1017_S0017089500006480,
     author = {Gerhard, J. A. and Petrich, Mario},
     title = {Free bands and free *-bands},
     journal = {Glasgow mathematical journal},
     pages = {161--179},
     year = {1986},
     volume = {28},
     number = {2},
     doi = {10.1017/S0017089500006480},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006480/}
}