Just in case.
http://mathworld.wolfram.com/PeriodicContinuedFraction.html
http://mathworld.wolfram.com/ContinuedFraction.html
http://mathworld.wolfram.com/Convergent.html
http://www.math.binghamton.edu/dikran/478/Ch7.pdf
http://www.classic-guitar.com/pythagor.html
http://www.research.att.com/~njas/sequences/DUNNE/Temperament2x.PDF
http://bellsouthpwp2.net/c/h/chetnajain/Lalit/home_files/extras/mathmusic.pdf
http://www.maths.abdn.ac.uk/~bensondj/html/music.pdf
http://www.midicode.com/tunings/Tuning10102004.pdf
http://www.midicode.com/tunings/greek.shtml#2.9
http://en.wikipedia.org/wiki/Equal_temperament#5_and_7_tone_temperaments_in_ethnomusicology