"id","author_first1","author_last1","title","year","publication","volume","pages","keyword0","keyword1","type" "1273","Emil","Betzler","Agrartechnische Innovationen und ihre Auswirkungen auf die Agrarlandschaft im Hochland der Arabischen Repubik Jemen","1988","Innsbrucker Geographie Studien","16","207-18","Highlands","KT","journal"