Sevilla, CG and JP Esguerra 2019. Theoretical analysis of the swinging Atwood’s machine with pendulum-in-pendulum system. Proceedings of the Samahang Pisika ng Pilipinas (Philippines, 2019), SPP-2019-2B-03. URL: https://proceedings.spp-online.org/article/view/SPP-2019-2B-03.