1.
Raudjärv M. Professor Emerit. Dr. rer. Pol. Manfred O. E. Hennies (10.09.1938–18.10.2019). In memoriam. TPEP [Internet]. 2019Dec.16 [cited 2020Dec.6];27(3-4):223-32. Available from: http://ojs.utlib.ee/index.php/TPEP/article/view/16239