Through his participation in talks of Sri Aurobindo with his disciples, Hohlenberg had acquired some basic knowledge which he used in 1916 for publishing his book titled Yoga i dens betydning for Europa (Yoga and its significance for Europe).
Durch seine Teilnahme an Gesprächen mit Sri Aurobindo hatte Hohlenberg ein Grundwissen erworben, das er 1916 in dem Buchtitel Yoga i dens betydning for Europa (Yoga in seiner Bedeutung für Europa) verarbeitete.