Kupets, Ljubov A. 2011. “The Antique Theme in Music of the Composers of the Nordic Countries (E. Grieg, J. Sibelius, D. Monrad Johansen)”. Music Scholarship / Problemy Muzykal’noj Nauki 8 (1):181-85. https://musicscholar.ru/index.php/PMN/article/view/484.