[Russian Text Ignored].Published in:Mathematical Logic Quarterly, 1983, v. 29, n. 7, p. 385, doi. 10.1002/malq.19830290702Publication type:Article
Masthead.Published in:Mathematical Logic Quarterly, 1983, v. 29, n. 7, p. fmi, doi. 10.1002/malq.19830290701Publication type:Article