@article{MZM_1977_22_1_a6,
     author = {A. M. Levin},
     title = {One conservative extension of formal mathematic analysis with a~scheme of dependent choice},
     journal = {Matemati\v{c}eskie zametki},
     pages = {61--68},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_1_a6/}
}