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http://www.physics.sfasu.edu/astro/binstar.htm/

http://isc.tamu.edu/~astro/binstar.html

http://astrosun.tn.cornell.edu/courses/astro201/binstar.htm

http://astrosun.tn.cornell.edu/courses/astro201/close_bin_stars.htm

http://astrosun.tn.cornell.edu/courses/astro201/bin_eclipse.htm

http://wonka.physics.ncsu.edu/www/Astro/Research/CSM/binary.html

http://www.science.widener.edu/uschultz/sproul5.html

http://universe.gsfc.nasa.gov/videos/millisecond.html

http://www.imsa.edu/intersession/cosmos/life/students/binar.html

http://wonka.physics.ncsu.edu/www/Astro/Resaerch/Algol/

http://oposite.stsci.edu/pubinfo/pr/97/26.html

http://www.physics.upenn.edu/umyers/astro12/L5.html

http://nova.planet.kobe-u.ac.jp/umatsuda/video.html