site.btaProf. Dr Ivan Mitev, who Made the Bulgarian Scientific Discovery of the 20th Century: the Sixth Heart Tone
The discovery of the sixth heart tone by Prof. Dr Ivan Mitev (1924-2006) was a long and complicated process, but was declared the Bulgarian scientific discovery of the 20th century, Prof. Mitev's son, Academician Prof. Dr Vanyo Mitev, said in a BTA interview.
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