Very little is known about this artist, several of his works have come to public attention in the last few years.
Often artists from the early part of the 20th century from Eastern Europe, even if they made it to the West or to Paris disappeared during the war.
Radovanovcitch is also an unusual name in the West, he may very well have worked under a different name at one point.
His work certainly refects the Art Deco style of Paris during the 1920s and 1930s, and also shows the influence of German Expressionism.
More research is necessary.