@article{DAN_1973_213_3_a8,
     author = {V. I. Malykhin and B. \`E. Shapirovskii},
     title = {Martin's axiom and properties of topological {spaces.~I}},
     journal = {Doklady Akademii Nauk},
     pages = {532--535},
     publisher = {mathdoc},
     volume = {213},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_3_a8/}
}