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APA Citation
Heinemann, B., Fantz, U., Kraus, W., Schiesko, L., Wimmer, C., Wünderlich, D., Bonomo, F., Fröschle, M., Nocentini, R., & Riedl, R. (n.d.). towards large and powerful radio frequency driven negative ion sources for fusion. New journal of physics, 19, . http://access.bl.uk/ark:/81055/vdc_100087629744.0x00002e