On expansions of β-models

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Fundamenta Mathematicae / All issues

J. Bilý, L. Bukovský Fundamenta Mathematicae 82 (1974), 239-244 DOI: 10.4064/fm-82-3-239-244