Research problem. 22
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Publication:1239345
DOI10.1007/BF02018505zbMath0361.10010OpenAlexW4205488602MaRDI QIDQ1239345
Publication date: 1977
Published in: Periodica Mathematica Hungarica (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1007/bf02018505
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