Die Klimate der Erde : Grundriss der Klimakunde

By W. Köppen. 1923

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Trend analysis of climate time series: A review of methods (2019, background): “This definition was developed around the end of the 19th century by Austrian, German and Russian–German researchers (Brückner, 1890; Hann, 1901; Köppen, 1923).”
Global mapping of Jatropha curcas yield based on response of fitness to present and future climate (2010, background): “The Köppen climate classification, based on the observed interaction between climate and native vegetation (Köppen, 1923) is still widely used to define agronomic potentials across different climates (Gallup & Sachs, 2000).”
The shared influence of phylogeny and ecology on the reproductive patterns of Myrteae (Myrtaceae) (2010, methodology): “The climate of the PEIC is classified, according to the Köppen system (Köppen 1923), as subtropical humid (Cfa) because it is always wet with no dry season and has a mean temperature above 20 C.”