LUMINANCE GRADIENTS AND EDGE EFFECTS.VAN DEN BRINK G; KEEMINK CJ.1976; VISION RES.; G.B.; DA. 1976; VOL. 16; NO 2; PP. 155-159; H.T. 1; BIBL. 11 REF.Article

MICROPROCESSOR-CONTROLLED CONTRAST SENSITIVITY MEASUREMENTSKEEMINK CJ; VAN DER WILDT GJ; VAN DEURSEN JBP et al.1979; MED. BIOL. ENGNG COMPUTG; GBR; DA. 1979; VOL. 17; NO 3; PP. 371-378; BIBL. 9 REF.Article

GRANDIENT DETECTION AND CONTRAST TRANSFER BY THE HUMAN EYE.VAN DER WILDT GJ; KEEMINK CJ; VAN DEN BRINK G et al.1976; VISION RES.; G.B.; DA. 1976; VOL. 16; NO 10; PP. 1047-1053; BIBL. 12 REF.Article