黃裕雄數位教學 數學/資訊
Symbolic dynamics Microsoft Academic
https://academic.microsoft.com/topic/16101541/publication/search?q=Symbolic%20dynamics&qe=And(Composite(F.FId%253D16101541)%252CTy%253D%270%27)&f=&orderBy=0
http://backup.itsoc.org/review/copy_of_07ple.pdf
https://cs.du.edu/~rpavlov/3705/math3705.html
https://www.math.ubc.ca/~andrewr/620341/pdfs/symb_sum.pdf