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by Groves, Robert M.; Fowler, Floyd J.; Couper, Mick P.; et al.
by Chun, Asaph Young; Larsen, Michael D.; Durrant, Gabriele; et al.
by Lynn, Peter
by Kohno; Masaru
by Wolf
by Callegaro, Mario; Manfreda, Katja Lozar; Vehovar, Vasja
by United States General Accounting Office
by Groves, Robert M.; Biemer, Paul P.; Lyberg, Lars E.; et al.