source:Source: https://www.researchgate.net/publication/342311361_MODELING_OF_VIBRATIONAL_PROCESSES_IN_DISCRETE_MATRIX_STRUC-TURES_APPROACH/fulltext/5eecb294299bf1faac629b36/MODELING-OF-VIBRATIONAL-PROCESSES-IN-DISCRETE-MATRIX-STRUC-TURES-APPROACH.pdf
