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by Wehman, Paul; Kregel, John
by von Kregel, Dora; Osinde, Dora
by Kregel, Jan A.; Kattel, Rainer; Harcourt, G. C.
by Kregel; Jan
by Kregel,J.A.
by von Kregel, Dora
by Corsi, Marcella; Kregel, Jan; D'ippoliti, Carlo
by Bresser-Pereira, Luiz Carlos; Kregel, Jan; Burlamaqui, Leonardo