R. J. Parham and  J. D. Knight,  The Effects of Four Organic Cropping Sequences on Soil Phosphorous Cycling and Arbuscular Mycorrhizal Fungi.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 566 - 568
    [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/16329.