References
Richard H. Schlagel
(1969). The paradox of perception. In L. Gabriel (Ed.). Sektionen I-IV (pp. 272-278). Freiburg-Basel-Wien: Herder.
(1969). The paradox of perception. In L. Gabriel (Ed.). Sektionen I-IV (pp. 272-278). Freiburg-Basel-Wien: Herder.