@article{MM2_1989__65_3_155430,
     author = {Hans Michael Uns\"old},
     title = {A4n-polyhedra with free homology.},
     journal = {Manuscripta mathematica},
     pages = {123--146},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1989},
     zbl = {0683.55002},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155430/}
}