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"Mie's Theory of Matter and Gravitation" by C. Smeenk and C. Martin and "Foundations of a Theory of Matter (excerpts)" by G. Mie as in "The Genesis of General Relativity - Sources and Interpretations" edited by M. Janssen, J. Norton, J. Renn, T. Sauer and J. Stachel (Springer, 2007), https://link.springer.com/book/10.1007/978-1-4020-4000-9