Title:Derroteros fundamentales de la cuestión de los principios en el pensamiento jurídico occidental del siglo XX / Fundamental courses of the question of principles in western legal thought of the 20th century / Derroteros fundamentais da questão dos princípios no pensamento jurídico ocidental do século XX
Title:Perception with looks like two different approach and prospects, since alexy and zagrebelsky / Percepción de dos miradas con igual enfoque y diferentes perspectivas, desde alexy y zagrebelsky