Reference

Z. Yi, Weibo Song, A. Warren, D.McL. Roberts, Khaled A. S. AL-Rasheid, Z. Chen, Saleh A. Al-Farraj, X. Hu (2008): A molecular phylogenetic investigation of Pseudamphisiella and Parabirojimia (Protozoa, Ciliophora, Spirotrichea), two genera with ambiguous systematic position – European Journal of Protistology – 44: 45 - 53.