not sure about official material but what i do is listen to cds of bands like Mashuggah that do funky polyrythmic stuff and then i sit down and prac like i'll just do some straight 8ths or 16ths on the bass or hh or wutever and then with a diff apendage i'll do like quarter or 8th triplets and when i get really good at that where i can do any two or three appendages at once then I will move on to practicing each apendage doing a diff time signature.....and also you have to work out your brain to...polyrythms are like heavy weights for our brains....you have to work out your brain just like your muscles....so wut i do is break down each time signature and i figure out what beats match up with what other beats in which other time signatures and at what speeds and such....for instance....3 measure of 4/4 = 2 measures of 6/8...each side their has 12 beats and when played both together at the same bpm the first beat of every 3rd measure will line up...so like on measures 1, 4, 7 and so on will have the same first down beat.....in order to do polyrytms you have to be able to figure out stuff like that and be able to think about different time signatures at once....good luck
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