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    <subfield code="a">A simplified presentation of Einstein's unified field equations</subfield>
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    <subfield code="a">A simplified presentation of Einstein's unified field equations by Levi-Civita is a technical guide written in the early 21st century. The text likely focuses on preparing math-heavy HTML sources for publication, converting MathJax expressions to SVG images, and managing workflows for updates and corrections.

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    <subfield code="a">Einstein, Albert, 1879-1955. Zur einheitlichen Feldtheorie</subfield>
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