?:authorAffiliation
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[\'Laboratory of Mathematics, Department of Mathematics and Computer Science, University of Douala, PO Box 24157, Douala, Cameroon.\', \'IRD, Sorbonne University, UMMISCO, F-93143, Bondy, France.\', \'University of Dschang Task-force for the Fighting of COVID-19, Department of Mathematics and Computer Science, University of Dschang, PO Box 67, Dschang,Cameroon.\', \'Department of Mathematics and Applied Mathematics, University of Pretoria, Pretoria 0002, South Africa.\', \'Normandie University, UNIHAVRE, LMAH, FR-CNRS-3335, ISCN, Le Havre, 76600, France.\', \'Postdam Institute for Climate Impact Research (PIK), Telegraphenberg A 31, 14412 Potsdam, Germany.\', \'Department of Physics, Humboldt Universitat zu Berlin, 12489 Berlin, Germany.\']
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