Found in 1 comment on Hacker News
mancmatt · 2015-05-28 · Original thread
From my masters project covering this I recommend http://www.amazon.com/The-Fractional-Calculus-Applications-D...

ended up coding up something similar but less general than Podlubny's http://www.mathworks.com/matlabcentral/fileexchange/36570-ma...

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