@article{10_4064_cm_15_1_135_139,
     author = {B. Gr\"unbaum},
     title = {The perimeter f {Minkowski} unit discs},
     journal = {Colloquium Mathematicum},
     pages = {135--139},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1966},
     doi = {10.4064/cm-15-1-135-139},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-15-1-135-139/}
}