school links
http://netzhk.com/material/material.htm
http://www6.plala.or.jp/material_works/
http://www.geocities.jp/ugokukabe/
http://www.anne-box.com/limit/f_maj.htm
not school links
http://www.cmi.hku.hk/Ref/Notes/ISws/sld034.htm
http://kcpcms.wisenews.net/wisecampus/index.do?srp_restore=discard&new-login=true