In memory of academician Pranciškus-Baltrus Šivickis 1882-1968 : Upon the occasion of the 115th anniversary of his birth and 30th anniversary of death - Jakimavičius, Algimantas (. Revue baltique. - Tallinn : [Verlag nicht ermittelbar], 1940-2002. - ISSN 1392-141X 11, 1998)