“…Consider a multi-agent system with one target agent followed by three tracking agents under the quasi-cyclic switched topologies, which is shown in Figure 2, where {φ 1 , 5), φ (6), φ(7)}, φ 3 = {φ(8), φ(9)}) and {φ 4 , φ 5 } ∈ N + us (φ 4 = {φ (10), φ (11), φ(12)}, φ 5 = {φ(13), φ (14), φ(15)}). (1)…”