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by Koopman, Nico; Vosloo, Robert
by Trenor, Casson; Koopman, Caia
by Theo Boer; Bart Cusveller; Bart Koopman; et al.
by Koopman, Siem Jan; Shephard, Neil
by Oscar Koopman
by Durbin, James; Koopman, Siem Jan
by Hilda Koopman and Anna Szabolcsi
by Koopman, Pieter; Clack, Chris
by INTERNATIONAL WORKSHOP ON THE IMPLEMENTA; Koopman, Pieter
by Koopman, Douglas L.