An archetype for mitigating the security threats in multi-cloud environment by implementing tree-based next-generation firewalls. - Muhammad Iftikhar Hussain; Jingsha He; Nafei Zhu; Zulfiqar Ali Zardari; Fahad Razque; Saqib Hussain; Muhammad Salman Pathan (J. Intell. Fuzzy Syst., 2021)