“…The above discussed ambiguities induced, in addition, strong empirical evidence, nor theoretical rationale to support it. Despite the early evidence of the inflection in the different formulations of Bradford's distribution, with the aim of providing a better curve fit (Brookes, 1968(Brookes, , 1969; upper tail (S-shaped curve), first noted by Groos (1967), and the fact that it appears too often to allow one to treat Haspers, 1976;Leimkuhler, 1967Leimkuhler, , 1980Maia & Maia, 1984;Morse, 1981a;Morse & Leimkuhler, 1979; Praunit as an isolated phenomenon, the J-shaped curve has been anticipated in most experimental as well as theoretical lich & Kroll, 1978;Vickery, 1948;Wilkinson, 1972). For a comprehensive review of theoretical models of approaches.…”