@book { TheEthicalNatureofKarlPoppersTheoryofKnowledge,
    title = "The Ethical Nature of Karl Popper's Theory of Knowledge",
    subtitle = "Including Popper's unpublished comments on Bartley and critical rationalism",
    author = "Mariano {Artigas}",
    year = "1999",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1089313"
}