Kramer, A. (1956) A quick rank test for significance of differences in multiple comparisons. Food Technol., 10 (8), 391
Kramer, A. (1960) A rapid method for determining significance of differences from rank sums. Food Technol., 14 (11), 576
Kahan, G., Cooper, D., Papavasiliou, A. & Kramer, A. (1973) Expanded tables for determining significance of differences for ranked data. Food Technol., 27 (5), 61