VELICHKOVA, K., & SIRAKOV, I. (2018). GROWTH PARAMETERS, PROTEIN AND PHOTOSYNTHETIC PIGMENT CONTENT OF CHLORELLA VULGARIS CULTIVATED UNDER PHOTOAUTOTROPHIC AND MIXOTROPHIC CONDITIONS. Bulgarian Journal of Agricultural Science, 24(Supplement 1), 150–155. https://agriacad.eu/ojs/index.php/bjas/article/view/5038