Trotsenko , V. A., and Y. V. Trotsenko. “Structure of Integrals of Equations of Oscillations of a Conical Shell Closed at a Vertex”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 73, no. 10, Oct. 2021, pp. 1414-22, doi:10.37863/umzh.v73i10.6702.