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Henryon C., Lambrechts E. Op. cit. P. 52, 53, 69; Goudsblom J. Op. cit. P. 50, 51, 53, 54, 56, 57, 123, 131, Tab. 4; Ishwaran K. Op. cit. P. 52, 53, 59, 118, 119, 175, 178, 188, 194, 196, 197, 212, 213, 216, 222, 227; Daalen P. van. Op. cit. Blz. 211, 212.