Dikio, E.D., and D.A. Isabirye. “Determination of Chlorophyll-A, Pheophytin-a and Β-Carotene Contents of Isolated Photosynthetic Reaction Centre Complexes”. Asian Journal of Chemistry, vol. 23, no. 11, Sept. 2011, pp. 5001-3, https://asianpubs.org/index.php/ajchem/article/view/11029.