Contaminants in the soil environment in the Australasia-Pacific Region. 18-23 February 1996. Kluwer Academic Publishers. Dordrecht, The Netherlands. Braum, S.M., and P.A. Helmke.
White lupine utilizes soil phosphorus that is unavailable to soybean.
Fitch, A., and P.A. Helmke. Helmke, P.A., and R.B. Corey. Physical and chemical considerations for the development of Lunar derived soils. Lunar derived soils for the growth of plants.