Lecce, 1986/9, 9, p. 243–262. Domenico M. Fazio, Nietzsche e il criticismo, Elementi kantiani e neokantiani e critica della dialettica hegeliana nella formazione filosofica del giovane Nietzsche, Urbino, QuattroVenti, 1991. Michael Steven Green, Nietzsche and the Transcendental Tradition, Urbana & Chicago, University of Illinois Press – International Nietzsche Studies Series, 2002. Michael Steven Green, "Nietzsche’s Place in Nineteenth Century German Philosophy", Inquiry, 2004, 47, p. 168–188. Review of Will Dudley, "Hegel, Nietzsche, and Philosophy: Thinking Freedom", Cambridge U. Press 2002. Michael Steven Green, "Was Afrikan Spir a Phenomenalist?: And What Difference Does It Make for Understanding Nietzsche?", The Journal of Nietzsche Studies, v46, n2, 2015, p. 152–176. Nadeem J. Z. Hussain, "Nietzsche's Positivism", European Journal of Philosophy, 2004,12, p. 326–368. Sergio Sánchez, "Logica, verità e credenza: alcune considerazioni in merito alla relazione Nietzsche–Spir" in: Maria Cristina Fornari (ed.), La trama del testo: Su alcune letture di Nietzsche, Lecce, Millela, 2000, p. 249–282. Sergio Sánchez, "Linguaggio, conoscenza e verità nella filosofía del giovane Nietzsche: I frammenti postumi del 1873 e le loro fonti", Annuario Filosofico, 2000, 16, p. 213–240. Sergio Sánchez, El problema del conocimiento en la filosofía del joven Nietzsche, Córdoba (Argentina), 2001 Karl Schlechta & Anni Anders, Friedrich Nietzsche: Von den verborgenen Anfängen seines Philosophierens, Stuttgart-Bad Cannstatt, F. Frommann, 1962, p. 119–122, 159–166. Robin Small, "Nietzsche, Spir, and Time",Journal of the History of Philosophy, 1994, 32, p. 82–102. Reprinted in Chapter One of Robin Small, Nietzsche in Context'', Aldershot, England: Ashgate, 2001. External links Claparède-Spir Family Papers at Harvard University Library Online version of Spir's Thought and Reality, 2d ed., 1877 Pensée et Réalité, 1896 (transl. of Thought and Reality) at Bibliothèque nationale de France Esquisses de Philosophie critique, 1887, at Bibliothèque nationale de France Paroles d'un sage, Paris-Genève, 1937 American website on Spir Article on African Spir Article on African Spir in a biographic dictionary Kirovohrad Regional Universal Research Library's Website on Spir (mostly in Ukrainian) Letters of Leo Tolstoy Book of Michael Steven Green, Nietzsche and the Transcendental Tradition (on African Spir-Nietzsche relationship) Fazio's article on African Spir-Nietzsche relationship 1837 births 1890 deaths 19th-century philosophers from the Russian Empire Kantian philosophers Epistemologists Russian logicians Russian people of German descent Russian philosophers Ontologists Foundationalism Deaths from the 1889–1890 flu pandemic People from the Russian Empire of German descent People from the Russian Empire of Greek descent Ukrainian people of German descent Ukrainian people of Greek descent Ukrainian people