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Reference
Littrow, Joseph Johann von: Anleitung zur Berechnung der Lebensrenten und Wittwenpensionen ohne Hülfe der Algebra. Wien : Im Verlage von J. G. Heubner, 1829. ETH-Bibliothek Zürich, Rar 21227, https://doi.org/10.3931/e-rara-55826 / Public Domain Mark
