Amirlatifi, فریبا, Shokravi, sh, Safaei, مریم, Hosseini kolbadi, زهرا. The effect of acidity at limited irradiance on survival, growth, pigment composition and ammonium liberation of soil cyanobacterium 
Nostoc sp., collected from paddy-fields of Golestan province. Journal of Plant Environmental Physiology. 2007;2(6):38-45. doi: