van Amersfoort, P. W., Bakker, R. J., Bekkers, J. B., Best, R. W. B., Vanbuuren, R. ., Delmee, P. F. M., … van der Wiel, M. J. (1991). Update on Felix. Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 304, 163-167. https://doi.org/10.1016/0168-9002(91)90841-d (Original work published)
DIFFER