CHRISTENSEN, R. Essence, Essence, and Essence. Studia Philosophica Estonica, [S. l.], v. 7, n. 2, p. 72–87, 2015. DOI: 10.12697/spe.2014.7.2.05. Disponível em: https://ojs.utlib.ee/index.php/spe/article/view/spe.2014.7.2.05. Acesso em: 16 apr. 2025.