RozhenkoN. N. “Quantum Oscillator in an Infinite-Particle Harmonic System”. Ukrains’kyi Matematychnyi Zhurnal 45, no. 9 (September 25, 1993): 1266–1273. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5929.