Verma, Amit Kumar, and Ashok Kumar Singh. “Role of H+ and Ca++ Concentrations on Vorticella Stalk Contraction Determination”. International Journal of Scientific Research in Biological Sciences 7, no. 2 (April 30, 2020): 77–81. Accessed May 20, 2025. https://ijsrbs.isroset.org/index.php/j/article/view/341.