Muhammademinov Alijon Azizjon o‘g‘li, Saidova Nigora Komiljonovna. STEFFENSEN (EYTKEN-STEFFENSEN) USULI . ilmiy [Internet]. 2024 May 2 [cited 2024 Oct. 6];20(3):97-100. Available from: http://web-journal.ru/index.php/ilmiy/article/view/4864