TY CONF TI THE CORNERS OF THE MISFIRES OF THE VECTOR GROUP VELOCITY AND WAVE VECTOR OF BACKWARD SPIN WAVES IN A FERRITE MAGNETIZED IN RELATION TO THE PLATE KW reverse spin wave KW wave vector KW group velocity vector KW the angle of cutoff JO XXIV international conference "Electromagnetic field and materials (fundamental physical research)" AU Lokk, E.. PY 2026 PB INFRA-M Academic Publishing LLC.