Analysis of information sources in references of the Wikipedia article "Cyclotron" in English language version.
State Institute of Radium, founded in 1922, now known as V. G. Khlopin Radium Institute
State Institute of Radium, founded in 1922, now known as V. G. Khlopin Radium Institute
State Institute of Radium, founded in 1922, now known as V. G. Khlopin Radium Institute