Self-organized criticality in the model of biological evolution describing interaction of "coenophilous” and “coenophobous” speciesO. V. Kovalev, Y. M. Pis'mak and V. V. VecherninEurophys. Lett., 40 4 (1997) 471-476DOI: https://doi.org/10.1209/epl/i1997-00490-0