Bobrik R. V. “Stability in the Average Quadratic for the Harmonic Oscillator With a Random Parameter”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 9 (October 7, 1992): 1276-1278. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/8180.