Algin, Sergei. “Positional Principle in Practice of Training to Game on the Keyboard of Organno-Piano Type”. ARTS AND MUSIC IN CULTURAL DISCOURSE. Proceedings of the International Scientific and Practical Conference (September 28, 2013): 73–80. Accessed April 6, 2025. https://journals23.rta.lv/index.php/AMCD/article/view/1264.