Title:Estudio y uso sustentable de la biota austral: ictiofauna continental argentina / Study and wise use of austral biota: freshwater fishes from Argentina
Title:The evolution of the powers of the Secretary-General of the United Nations in the field of peaceful settlement of disputes / by S. Sanz Caballero ; tutor, Dr. U. Kischel. / Universalism and regionalism in the established international system.