1. Soil Characteristics of the Al Hassa Oasis;Al-Barrak,1993
2. Cation exchange equilibria in soils affected by Na salts;Bower;Soil Science,1959
3. Rapid conductometric method for estimating gypsum in soils;Bower;Soil Science,1948
4. Contribution to a utilitarian classification of gypsum in soils;Boyadgiev;Geoderma,1996
5. Quantitative Xray mineral analysis of clays;Brindley,1980