@article{IM2_1974_8_6_a3,
     author = {V. I. Amstislavskii},
     title = {Recursiveness and $R^c$-operations},
     journal = {Izvestiya. Mathematics },
     pages = {1209--1224},
     publisher = {mathdoc},
     volume = {8},
     number = {6},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1974_8_6_a3/}
}