Sadatov Chori Xolmurodovich, Qudratov Javli Xolbozorovich. THEORETICAL FUNDAMENTALS OF STUDY PEN AND GENERAL PRINCIPLES OF DRAWING. Galaxy int. interdiscip. res. j. [Internet]. 2021 Oct. 29 [cited 2024 Nov. 26];9(10):709-16. Available from: https://giirj.com/index.php/giirj/article/view/426