1. Quarterly Journal of Mechanics and Applied Mathematics;Duncan;A critical examination of the representation of massive and elastic bodies by systems of rigid masses elastically connected,1952
2. Quarterly Journal of Mechanics and Applied Mathematics;Livesley;The equivalence of continuous and discrete mass distributions in certain vibration problems,1955
3. The Aeronautical Quarterly;Leckie;The effect of lumped parameters on beam frequencies,1963
4. Vibration Problems in Engineering;Timoshenko,1955