Reference
Zeitschrift für Vermessungswesen, 1878, p. 209, et 1879, p. 97.
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Raïnoff, R. Bulgarie. Bull. Géodésique 53, 39–43 (1937). https://doi.org/10.1007/BF03031212
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DOI: https://doi.org/10.1007/BF03031212