@article{DA_1976_15_a4,
     author = {S. A. Morozov},
     title = {The problem of finding the shortest connecting tree with a constraint},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {40--47},
     year = {1976},
     number = {15},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1976_15_a4/}
}