@article{RM_1979_34_6_a12,
     author = {I. I. Parovichenko},
     title = {Some constructions of~set-theoretical operations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {92--102},
     publisher = {mathdoc},
     volume = {34},
     number = {6},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_6_a12/}
}