Usefulness of cyanide-nitroprusside test in detecting incomplete recessive heterozygotes for cystinuria: a standardized dilution procedure. - Finocchiaro,R.; D'Eufemia,P.; Celli,M.; Zaccagnini,M.; Viozzi,L.; Troiani,P.; Mannarino,O.; Giardini,O. (Urol Res, 1998)