@article{MM2_1996__89_3_156166,
     author = {M.A. Mor\'on and F.R. Ruiz del Portal},
     title = {Ultrametrics and infinite dimensional whitehead theorems in shape theory.},
     journal = {Manuscripta mathematica},
     pages = {325--334},
     publisher = {mathdoc},
     volume = {89},
     number = {3},
     year = {1996},
     zbl = {0855.54022},
     url = {http://geodesic.mathdoc.fr/item/MM2_1996__89_3_156166/}
}