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The three dimensional bottleneck assignment problem and some of its variants are studied in the present paper. A procedure is developed for each of these bottleneck assignment problems.

The present paper studies a paradox in Linear Fractional Transportation Problems with 'mixed constraints'. A sufficient condition for the existence of a paradox is established. Paradoxical range of flow is obtained for any flow in which the corresponding objective function value is less than that of the original Linear Fractional Transportation Problem with 'mixed constraints'