proposed a cyclical model for karstic landscape development. The results of this work written in French were made accessible to English-language scientists in 1921 when it was commented by E.M. Sanders. Differences in climate and geology were used by Cvijić to explain various shapes and types of karst landforms, sometimes incorrectly. Nevertheless, his views on the role of climate on the development of karst were more accurate than those of various climatic geomorphologists that succeeded him and who greatly exaggerated the role of climate. It has been attributed to Cvijić that the term karst prevailed over Edouard Martel's proposed term "Le Causse". Another terminology usage indebted to Cvijić is that of doline, a term he introduced, and that overlaps with that of sinkhole. Eventually, Cvijić emerged as the "father of karst geomorphology". Human geography Concurrently, he developed an interest in the life of people living in the Balkans. His travels took him to Macedonia and its lakes, the coastlines of Albania and Greece, to Lake Skadar and Lake Pamvotida. In 1902 he published his first work on human geography. In 1906 he published his signature monograph Basics of Geography and Geology of Macedonia and Old Serbia, which would become a staple reference for future researchers. In 1896 Cvijić published "Instructions for studying villages in Serbia and other Serbian lands", which was later revised to apply to other Balkan regions. Cvijić's thesis on the effects of climate and geography on human life is the basis of his approach to human geography, where he emphasizes that humankind is ecologically sensitive. When classifying anthropological types Cvijić considered social structure (work, endogamy, exogamy and migration) the primary factor, stressing the effects of the physical environment on a population's psyche. His basic concepts are presented in the 1902 Balkan-peninsula paper, "Human-geography problems". Influenced by Cvijić's paper, Milorad Dragić (a former student) elaborated on psychological anthropological research in his 1911 paper "Instructions for studying settlements and psychological characteristics" (after which Cvijić expanded his thesis on "The Balkan peninsula and South Slavic lands" in Serbian). Cvijić introduced the term 'metanastasic movements', which referred to slow, gradual, a place-to-place human movement. He and his students took wide exploration of this phenomenon, eventually establishing the Serbian ethnological-historic school which gathered ethnological material from all around the Balkan peninsula and encompassed exploration of written sources. The sparking of interest in human-geographical and ethnographical research was one of the greatest achievements