@article{AM2_1992__43_1_137438,
     author = {Frank Morgan},
     title = {Calibrations and the size of {Grassmann} faces.},
     journal = {Aequationes mathematicae},
     pages = {1--13},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1992},
     zbl = {0766.53048},
     url = {http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137438/}
}