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@article{MT_1994_27_a1, author = {A. A. Ageev}, title = {Complexity of the network problem of a median on planar lattices}, journal = {Matemati\v{c}eskie trudy}, pages = {6--13}, publisher = {mathdoc}, volume = {27}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MT_1994_27_a1/} }
A. A. Ageev. Complexity of the network problem of a median on planar lattices. Matematičeskie trudy, Tome 27 (1994), pp. 6-13. http://geodesic.mathdoc.fr/item/MT_1994_27_a1/