Hart, Jeffrey (1974) Symmetry and Polarization in the European International System, 1870-1879: A Methodological Study, Journal of Peace Research 11 (3): 229–244.
Journal article
Hart, Jeffrey (1974) Symmetry and Polarization in the European International System, 1870-1879: A Methodological Study, Journal of Peace Research 11 (3): 229–244.