Dynamics of variability of the animal heart rhythm and its correlation with economic parameters and ageA. S. Emelyanova, L. G. Kashirina, E. E. Stepura, S. D. Emelyanov and Yu. P. BorychevaBIO Web Conf., 17 (2020) 00095DOI: https://doi.org/10.1051/bioconf/20201700095