@article{10_1017_S0017089500005437,
     author = {Petrich, Mario and Reilly, Norman R.},
     title = {The join of the varieties of strict inverse {Semigroups} and rectangular bands},
     journal = {Glasgow mathematical journal},
     pages = {59--74},
     year = {1984},
     volume = {25},
     number = {1},
     doi = {10.1017/S0017089500005437},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500005437/}
}