@article{ZNSL_1976_61_a1,
     author = {N. V. Grigorevskii and I. S. Shiganov},
     title = {Some modifications of the {Dudley} metric},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {17--24},
     publisher = {mathdoc},
     volume = {61},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_61_a1/}
}