@article{Kallikorm_Tuvik_2014, title={ Professor Reinhold Birkenfeldt 80 }, url={https://ojs.utlib.ee/index.php/EA/article/view/11649}, DOI={10.15157/ea.v0i0.11649}, abstractNote={ Eesti Arst 2014; 93(6):360 }, journal={Eesti Arst}, author={Kallikorm, Riina and Tuvik, Piia}, year={2014}, month={Jun.} }