http://mathforum.org/kb/thread.jspa?thr ... tstart=690
http://images.google.com/images?hl=en&s ... =&aql=&oq=
http://scholar.google.ca/scholar?q=%22b ... as_sdtp=on
http://scholar.google.ca/scholar?hl=en& ... =&as_vis=0
http://www.google.com/search?tbm=bks&tb ... physics%22
http://www.google.com/search?tbm=bks&tb ... 54baca4f6e