Lukong, C., & Onwubiko, H. (2004). Calcium, Copper Protein And Oxygen Affinity In Haemocyanins Of Aestivating And Nonaestivating Snails (<i>Achatina achatina</i>). Bio-Research, 2(1), 115–123. https://doi.org/10.4314/br.v2i1.28549