TY - JOUR T1 - Colour-Blindness and the Trichromatic Theory of Colour Vision. Part III. Incomplete Colour-Blindness JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 86 IS - 583 SP - 42 EP - 56 PY - 1911/12/22/ UR - http://dx.doi.org/10.1098/rspa.1911.0079 M3 - doi:10.1098/rspa.1911.0079 AU - de W. Abney, W. ER -