TY JOUR TI "System of language" by K. Heyse and "Philological notes" KW linguohistoriography KW "Philological notes" KW German linguistics KW XIX century KW "System of linguistics" KW K. Heyse KW I.M. Zheltov JO The Journal of Philological Studies AU Lukin, O.V. PY 2022 IS 7 PB INFRA-M Academic Publishing LLC.