In his main work, "Fizica teoretica" (Bucuresti, 1957, vol. I, p. 270) Teofil Vescan, professor of Bolyai University in Kolozsvár (Cluj) revealed that Gaál Sándor may have described the cyclotron's working at about the same time as Ernest O. Lawrence during the spring of 1929. In 1929 Gaál allegedly sent a study, with the title Die Kaskadenröhre. Ein Beitrag zum Problem der Atomkernzerstrümmerung to the physics periodical Zeitschrift für Physik. The paper registered the study as of 6 May 1929 but it was not printed because the editors missed the topic of the study and erroneously thought that it dealt with particle accelerators, a problem already solved in 1928 by Norwegian physicist Rolf Wideröe.