@article{MAT_1965_9_4_a8,
     author = {R. DeMarr},
     title = {Common fixed points for commuting contraction mappings},
     journal = {Matematika},
     pages = {139--141},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1965_9_4_a8/}
}