Marіño-Pérez Ricardo, Mayén-Estrada Rosaura, Macіp-Ríos R., Dovgal I. V. (2011) Morphometric variations of discophrya elongata (Ciliophora, Suctorea) attached to two different species of aquatic true bugs (hemiptera, prosorrhyncha, nepomorpha). Vestnik zoologii (45 (5)). С. 13–19.