1. Composición química y valor alimenticio de algunas plantas indígenas y cultivadas en la Republica Argentina;Abiusso N. G.;Rev. Inv. Agr.,1962
2. The composition of the ash of meadow‐steppe vegetation of the stony steppe and ist effect on the formation of mineral soil colloids;Aidinian R. Kh.;Pochvovedenie n,1954
3. Opal phytoliths in some Victorian soils and "red rain" residues
4. Fossil opal‐phytoliths and phytolith nomenclature;Baker G.;Austr. J. Sci.,1959
5. SOME FEATURES OF THE DISTRIBUTION OF PLANT-OPAL IN ILLINOIS SOILS