On the linearity of the MINOS light-injection calibration system - Adamson, P.; Barrett, L.; Belias, A.; Blake, A.; Cabrera, A.; Falk, E.; Harris, P.G.; Hartnell, J.; Howcroft, C.; Kordosky, M.; Lang, K.; Lee, R.; et al. (Nuclear Instruments & Methods in Physics Research Section A, 2004)