Ottoi Călin (March 1886 – 1 April 1917) was a Romanian physician, journalist and socialist militant, considered one of the theoreticians of the during the early 20th century.
Ottoi Călin (March 1886 – 1 April 1917) was a Romanian physician, journalist and socialist militant, considered one of the theoreticians of the during the early 20th century. (en)