NEUE MÖGLICHKEIT FÜR EINE EINHEITLICHE FELDTHEORIE VON GRAVITATION UND ELEKTRIZITÄT. [New Possibility for a Unified Field Theory of Gravity and Electricity]. Sonderabdruck [Offprint] aus den Sitzungsberichten der Preussischen Akademie der Wissenschaften, physikalisch-mathematischen Klasse, XVIII (1928).

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