1- Baziramakenga R., Simard R.R., and Leroux G.D. 1995. Determination of organic acids in soil extracts by ion chromatography, Soil Biology and Biochemistry Journal, 27 (3): 349-356.
2- Bissani C.A. 2000. Effects of root derived organic acids on metal speciation in soil solution and bioavailability. Ph.D dissertation of soil science.University of Wisconsin-Madison.
3- Chiang K., Wang Y., Wang M., and Chiang P. 2006. Low molecular weight organic acids and metal speciation in rhizosphere and bulk soils of a temperate rain forest in Chitou, Taiwan, Taiwan Journal for Science, 21 (3): 327-337.
4- Dessureault- Rompre J., Nowack B.,Schulin R., Tercier- Weber M.L., and Luster J. 2008. Metal solubility and speciation in the rhizosphere of Lupinusalbus cluster roots, Environmental Science and Technology, 42: 7146- 7151.
5- Duffner A., Hoffland E., and Temminghof E.J.M. 2012. Bioavailability of zinc and phosphorus in calcareous soils as affected by citrate exudation, Plant and Soil Journal, 361: 165-175.
6- Fischer H., Ingwersen J., and Kuzyakove Y. 2010. Microbial uptake of low- molecular- weight organic substances out-compete sorption in soil, European Journal of Soil Science, 61: 504-513.
7- Fujii K., Aoki M., and Kitayama K. 2012. Biodegradation of low molecular weight organic acids in rhizosphere from a tropical montane rain forest, Soil Biology and Biochemistry Journal, 47: 142-148.
8- Gahoonia T.S., Asmar F., Giese H., Gissel- Nielsen G., and Nielsen N.E. 2000. Root-release organic acids and phosphorus uptake of two barely cultivars in laboratory and field expriments, European Journal of Agronomy, 12: 281-289.
9- Gang X., Hongbo S.,Rongfu X., Nie Y., Pei Y., Sun Z., and Blackwell M.S.A. 2012. The role of root-released organic acids and anions in phosphorus transformations in a sandy loam soil from Yantai, China, African Journal of Microbiology Research, 6 (3): 674- 679.
10- Hoffland E., Wei C., and Wissuwa M. 2006. Organic anion exudation by lowland rice (OryzasativaL.) at zinc and phosphorus deficiency, Plant and Soil Journal, 283: 155-162.
11- Jones D.L. 1998. Organic acids in the rhizosphere – a critical review, Plant and Soil Journal, 205: 25-44.
12- Khademi Z. 2006. Organic acids behaviour in calcareous soils.Ph.D dissertation of soil science.School of agriculture and forest sciences, University of Wales, Bangor, Gwynedd.
13- Khademi Z., Jones D.L., Malakouti M.J.,Asadi F., and Ardebili M. 2009. Organic acid mediated nutrient extraction efficiency in three calcareous soils, Australian Journal of Soil Research, 47: 213-220.
14- Khademi Z., Malakouti M.J., and Jones, D.L. 2007. Effect of root organic acids on nutrients uptake in rhizosphere, Water and Soil Sciences Journal, 21 (2): 179-189.
15- Malakouti M.J., Keshavarz P., and Karimian N.A. 2008.A comprehensive approach towards identification of nutrients deficiencies and optimal fertilization for sustainable agriculture, TarbiatModares University Press, Tehran.
16- Moradi N., Rasouli-Sadaghiani M.H, Sepehr E., and Abdollahi B. 2011. Effect of low molecular weight organic acid on phosphorus adsorption in calcareous soils, Iranian journal of Soil and Water Research, 42(2).233-239.
17- Oburger E., Kirk G.J.D., Wanzel W.W., Puschenreiter M., and Jones D.L. 2009. Interactive effects of organic acids in the rhizosphere,Soil Biology and Biochemistry Journal, 41: 449-457.
18- Palomo L., Classen N., and Jones D.L. 2006. Differential mobilization of P in the maize rhizosphere by citric acid and potassium citrate, Soil Biology and Biochemistry Journal, 38: 683- 692.
19- Prieto C., Lozano J.C., Rodriguez P.B., and Tome F.V. 2013. Enhancing radium solubilization in soils by citrate, EDTA, and EDDS chelating amendments, Journal of Hazardous Materials, 250-251: 439-446.
20- Ryan P.R., Delhaize E., and Jones D.L. 2001. Function and mechnism of organic anion exudation from plant roots, Annual Review of Plant Physiology and Plant Molecular Biology, 52: 527-560.
21- Strom L., Owen A.G., Godbold D.L., and Jones D.L. 2001. Organic acid behaviour in a calcareous soil: sorption and biodegradation rates, Soil Biology and Biochemestry Journal, 33: 2125- 2133.
22- Strom L., Owen A.G., Godbold D.L., and Jones D.L. 2002. Organic acids mediated P mobilization in the rhizosphere and uptake by maize roots, Soil Biology and Biochemistry Journal, 34: 703- 710.
23- Strom L., Owen A.G., Godbold D.L., and Jones D.L. 2005. Organic acid behaviour in a calcareous soil implications for rhizosphere nutrient cycling, Soil Biology and Biochemestry Journal, 37: 2046- 2054.
24- Yong-Liang C., Yu-Qiang G., Shi-jie H., Chung-jing Z., Yu-mei Z., and Guo-ling C. 2002. Effect of root organic acids on the activation of nutrients in the rhizospheresoil, Journal of Forestry Research, 13(2) 115-118.
25- Zhi-An L., Bi Z., Hang-Ping X., Yong-Zhen D., Wan-Neng T., and Sheng-Lei F. 2008.Role of low-molecular-weight organic acid and their salt in regulating soil pH, Pedosphere, 18(2): 137-148.