Fig. 6From: Stability analysis and numerical evaluations of a COVID-19 model with vaccinationThe REFs related to susceptible population: Unvaccinated \(\mathbb {R}_{1,\mathcal {J}}^{n}(t)\) (left) and vaccinated \(\mathbb {R}_{2,\mathcal {J}}^{n}(t)\) (right) obtained via QLM-SCPSK methodology using \(\mathcal {J}=10,20\) and fixed \(N=100\) on [0, 1000]Back to article page