Polynomial robust observer implementation based passive synchronization of nonlinear fractional-order systems with structural disturbances. - Kammogne Soup Tewa Alain; Michaux Noubé Kountchou; Romanic Kengne; Ahmad Taher Azar; Hilaire Bertrand Fotsin; Soup Teoua Michael Ouagni (Frontiers Inf. Technol. Electron. Eng., 2020)