@article{SD_1971-1972__25_2_A6_0,
     author = {Munn, Walter},
     title = {Free inverse semigroups},
     journal = {S\'eminaire Dubreil. Alg\`ebre et th\'eorie des nombres},
     note = {talk:J6},
     pages = {J1--J1},
     publisher = {Secr\'etariat math\'ematique},
     volume = {25},
     number = {2},
     year = {1971-1972},
     zbl = {0342.20027},
     language = {en},
     url = {http://www.numdam.org/item/SD_1971-1972__25_2_A6_0/}
}