@article{SF_1991__43_3_135095,
     author = {P.R. Jones},
     title = {On free products of bands.},
     journal = {Semigroup forum},
     pages = {53--62},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1991},
     zbl = {0723.20036},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135095/}
}