@article{DAS_2016_a5,
     author = {Konstantin Makarychev and Yury Makarychev},
     title = {A {Union} of {Euclidean} {Metric} {Spaces} is {Euclidean}},
     journal = {Discrete analysis},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DAS_2016_a5/}
}