Ð¡Ð°Ñ‚Ñ‹Ð»Ð³Ð°Ð½, Ð., Ð¨Ð°Ð»Ñ‚Ð°Ð±Ð°ÐµÐ²Ð°, Ð., & ÐšÑƒÑ€Ð¼Ð°Ð½Ð±ÐµÐºÐ¾Ð²Ð°, Ð. 2020 Dec 21. Ð¡ÐÐ˜Ð–Ð•ÐÐ˜Ð• Ð¨Ð£ÐœÐ Ð”Ð•Ð Ð•Ð’ÐžÐžÐ‘Ð ÐÐ‘ÐÐ¢Ð«Ð’ÐÐ®Ð©Ð˜Ð¥ Ð¡Ð¢ÐÐÐšÐžÐ’ Ð Ð•Ð’Ð•Ð Ð‘Ð•Ð ÐÐ¦Ð˜ÐžÐÐÐžÐ™ ÐšÐÐœÐ•Ð ÐžÐ™. SDU Bulletin: Natural and Technical Sciences. [Online] 53:2