16A62
- : Von Neumann regular rings and the Whitehead property of modules. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 31 (1990), issue 4, pp. 621-625
- : Lattices of orthogonal theories. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 4, pp. 595-603
- : $E$-rings and differential polynomials over universal fields. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 1, pp. 159-166
- : Projective purities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 1, pp. 99-107
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