1. Abuscreen Roche diagnostics, Nutley. New Jersey.
2. GOTTHEIL E., CADDY G.R., AUSTIN D.L.: Faillibility of urine drug screens in monitoring methadone programs. JAMA236 (9), 1035–1038 (1976).
3. KIM H.J., CERCEO E.: Interference by NaCl with the EMIT method of analysis for drugs of abuse. Clin. Chem.22 (11), 1935–1936 (1976).
4. KOKOSKI R.J., HAMNER S., SHIPLET M.: Benzodiazepine tranquilizer abuse in narcotic addict treatment programs: urinalyses as a detection and control measure. 36th annual meeting scientific committee on drug dependence, Mexico City, Mex., March 1974.
5. PEAT M.A.: Screening for drugs of abuse in urine samples from a drug addiction center. Clin. Toxicology9 (2), 203–219 (1976).