: N. V. Juhnel, N. V. Demchenko, V. R. Romanchuk, and others.
: Physical copies and PDF versions are often circulated in educational communities and social media archives . : N. V. Juhnel
: For the "Practicum-1" and other supplementary materials by Juhnel, official answer guides are available directly from the publisher Aversev . Summary of the Textbook N. V. Demchenko
: Reliable answer keys for specific units and exercises are commonly hosted on platforms like GDZ.ru, which is known for verified school solutions. V. R. Romanchuk