TY CONF TI Challenges of high-resolution spectroscopy in the Nasmyth focuses of the BTA KW instrumentation: spectrographs; telescopes JO Modern astronomy: from the Early Universe to exoplanets and black holes AU Panchuk, V.. AU Klochkova, V.. AU Yushkin, M.. AU Zhuklevich, G.. PY 2024 PB Special Astrophysical Observatory of the Russian Academy of Sciences