@article{MZ_1972__125_171704,
     author = {Dion Gildenhuys and Lim Chong-Keang},
     title = {Free {Pro-...-Groups.}},
     journal = {Mathematische Zeitschrift},
     pages = {233--254},
     publisher = {mathdoc},
     volume = {125},
     year = {1972},
     zbl = {0221.20048},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171704/}
}