ISBN-13: 9781138568648 / Angielski / Miękka / 2019 / 694 str.
ISBN-13: 9781138568648 / Angielski / Miękka / 2019 / 694 str.
This work, which is here present in the English language, is based on a course of lectures given at the University of Helsingfors, Finland, during the academic year 1916-17.