Eleftheriadou AK, Karabinis AI, Baltzopoulou AD. Fundamental period versus seismic damage for reinforced concrete buildings. Proc. 15th World Conf. Earthq. Eng. Lisboa, 2012.
 Patel SK, Desai AN, Patel VB. Effect of Number of Storeys To Natural Time Period of Building. Natl. Conf. Recent Trends Eng. Technol., 2011, p. 13–5.
 Siddika A, Awall M, Mamun M, Al A, Humyra T. Study on natural frequency of frame structures. Comput Eng Phys Model 2019;2:36–48.
 Bhuskade SR, Sagane SC. Effects of various parameters of building on natural time period. Int J Eng Res Technol 2017;6:181–2278.
 Ji D, Li L. Modal analysis of frame structure teaching building. 2014 Int. Conf. Mechatronics, Electron. Ind. Control Eng., Atlantis Press; 2014, p. 1724–7.
 Edskär I. Modal analysis, dynamic properties and horizontal stabilisation of timber buildings 2019.
 Alghuff AY, Shihada SM, Tayeh BA. Comparative study of static and response spectrum methods for seismic analysis of regular RC buildings. J Appl Sci 2019;19.