@article{CMH_1992__67_3_140259,
     author = {Peter McMullen and Egon Schulte},
     title = {Locally toroidal regular polytopes of rank 4.},
     journal = {Commentarii mathematici Helvetici},
     pages = {77--118},
     publisher = {mathdoc},
     volume = {67},
     number = {3},
     year = {1992},
     zbl = {0784.52016},
     url = {http://geodesic.mathdoc.fr/item/CMH_1992__67_3_140259/}
}