1. Chlorites and hydroxy interlayered venniculite and smectite;Barnishel,1989
2. Urease activity on a clay-organic complex;Boyd;Soil Science Society of America Journal,1985
3. Urease activity in soils;Bremner,1978
4. Extraction of an urease-active organo-cornplex from soil;Burns;Soil Biology & Biochemistry,1972
5. Concerning the location and persistence of soil urease;Burns,1972