1. Dragons and toads. The chinese seismoscope of A.D. 132;Sleeswyk;East Asian Sci. Technol. Med.,1983
2. Reconstruction design of the lost seismoscope of ancient China;Yan;Mech. Mach. Theory,2007
3. The Pendulum A Case Study in Physics;Baker,2005
4. C. Huygens, Horologium Oscillatorium: Sive, De Motu Pendulorum Ad Horologia Aptato Demostrationes Geometricae, F. Muguet, Paris, 1673. https://books.google.pl/books?id=SvkuAAAAQAAJ&printsec=frontcover&hl=pl&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false https://books.google.pl/books?id=LU5eAAAAcAAJ&printsec=frontcover&hl=pl&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false.
5. The Mechatronics Handbook;Bishop,2002