On the Square of a Formally Self-Adjoint Differential Expression
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Publication:5585600
DOI10.1112/jlms/s2-1.1.661zbMath0191.38402OpenAlexW1988217184MaRDI QIDQ5585600
Publication date: 1969
Published in: Journal of the London Mathematical Society (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1112/jlms/s2-1.1.661
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