Fig. 8From: Stability analysis and numerical evaluations of a COVID-19 model with vaccinationThe REFs related to recovered population: Unvaccinated \(\mathbb {R}_{5,\mathcal {J}}^{n}(t)\) (left) and vaccinated \(\mathbb {R}_{6,\mathcal {J}}^{n}(t)\) (right) obtained via QLM-SCPSK methodology using a fixed \(J=15\) and various \(N=50,100,200\) on [0, 1000]Back to article page