- http://forum.codecall.net/topic/49752-big-integers – Java How to BigInteger
- http://compsci.ca/v3/viewtopic.php?t=13193 – BigInteger tut
- http://www.java2s.com/Tutorial/Java/0040__Data-Type/UseBigInteger.htm – Java2s BigInteger
- http://docs.oracle.com/javase/7/docs/api/java/math/BigInteger.html – Oracle documentation of BigInteger
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