“…However, sometimes the non-minimal values of I are also discussed as they lead to the EPI method's models, which are of a physical significance [3,4]. Some discussion on this topic can be also found in [14]. For example, from the analogy with the EPI model of momentum distribution presented in [4], for N > 1 the nonequilibrium, stationary solutions for the square flow (where the flow is proportional to the root productivity) might be obtained instead.…”