@article{SF_1984__30_134726,
     author = {M.A. Reynolds},
     title = {A new construction for free inverse semigroups.},
     journal = {Semigroup forum},
     pages = {291--296},
     publisher = {mathdoc},
     volume = {30},
     year = {1984},
     zbl = {0535.20035},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134726/}
}