1. American Petroleum Institute, 1968. API Recommended Practice for Analysis of Oilfield Waters. Subcommittee on Analysis of Oilfield Waters, API RP 45, 2nd ed., 49 pp
2. Atomic Absorption Spectrometry in Geology.;Angino,1967
3. Handbook for Analytical Quality Control in Water and Wastewater Laboratories.;Ballinger,1972
4. Ammonium as one of the indications of oil-gas content;Bogomolov;Dokl. Akad. Nauk S.S.S.R.,1970
5. APDC-MIBK extraction system for the determination of trace elements in saline waters by atomic absorption spectro-photometry;Brooks;Talanta,1967