His Erkenntnis und wissenschaftliches verhalten, 1936.
Info. converted from 678, 2012-10-02 (b. 1912)
Wikipedia WWW site, Jan. 14, 2009 (under Arne Næss: Arne Dekke Eide Næss; b. Jan. 27, 1912; d. Jan. 12, 2009; founder of deep ecology; widely regarded as the foremost Norwegian philosopher of the 20th century)