Fernando, M.H.J.S.2020-08-282020-08-281980Engineer, 8(2-4)/9(1-2):p.61-64https://dl-iesl.nsf.gov.lk/handle/1/2342Engineering and TechnologyMultirotor systemsNatural frequencyMechanical vibrationsA fast convergence technique for the determination of the first natural frequency of semi definite torsional systemsArticle