sentence1: in ref , the authors have derived an upper bound for the mir between two nodes or two groups of nodes of a complex dynamical network that depends on the two largest lyapunov exponents l 1 and l 2 of the subspace of the network formed by these nodes .
sentence2: in ref , the authors have derived an upper bound for the mir between two nodes or two groups of nodes that depend on the largest lyapunov exponents of the subspace of the network formed by the nodes .