at the same time, milanković began publishing numerous books on the history of science, including "isaac newton and newton's principia" (1946), "the founders of the natural science pythagoras – democritus – aristotle – archimedes" (1947), "history of astronomy – from its beginnings up to 1727" (1948), "through empire of science – images from the lives of great scientists" (1950), "twenty-two centuries of chemistry" (1953), and "techniques in the ancient times" (1955).