1. Faculty of Education, Chinese University of Hong Kong http://www.fed.cuhk.edu.hk/sci_lab/ntnujava/index.html
  2. Physics World http://www.hk-phy.org/ntnujava/index.html
  3. Science Deptartment, Hong-Kong International School http://dragonnet.hkis.edu.hk/hs/science/Physics/applications/applets/ntnujava/index.html
  4. Department of Physics, Hong Kong University of Science & Technology [s]http:/ /phms04.phys. ust.hk/ntnujava/[/s]
    Chinese version mirror page [s]http:/ /phms04.phys .ust.hk/ntnujava/indexChinese.htm[/s]