Ghlaim, Kadhim H., and Hatem R. Waseem. “Vibration Characteristics Oblate Shell ‘With and Without Framed Structure’”. Al-Khwarizmi Engineering Journal, vol. 6, no. 2, June 2010, pp. 1-10, https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/484.