Oladele, S. B., Esievo, K. A. N., Abdu, P., & Nok, A. J. (2008). In vitro Effects of Calcium, Magnesium, Mercury and Copper Ions on Neuraminidase of a Nigerian Newcastle Disease Virus Strains. International Journal of Poultry Science, 7(6), 565–569. https://doi.org/10.3923/ijps.2008.565.569