Leong, Y.K. , Sganzerla, M., Berndt, C.C. , and Campbell, G.R. (2008) Metal ions solubility in plant phosphoric acid: degree of ammonia neutralization and temperature effects. Industrial & Engineering Chemistry Research, 47 (5). pp. 1380-1385.

Campbell, Graeme Robert (2007) A rheological study of ammonium phosphate slurries. PhD thesis, James Cook University.

Campbell, G.R., Leong, Y.K., Berndt, C.C., and Liow, J.L. (2006) Ammonium phosphate slurry rheology and particle properties - The influence of Fe(III) and A(III) impurities, solid concentration and degree of neutralization. Chemical Engineering Science, 61 (17). pp. 5856-5866.

Campbell, Graeme R., Leong, Yee-Kwong, and Yeow, Y. Leong (2005) Obtaining the shear stress shear rate relationship and yield stress of liquid foods from parallel disk data. Journal of Food Science, 70 (1). pp. 50-55.