WASET
AliMohammadzadeh, R. , Chehreghani, M. , Zarnani, A. , Rahgozar, M. (2008), 'W3-Miner: Mining Weighted Frequent Subtree Patterns in a Collection of Trees', World Academy of Science, Engineering and Technology, Open Science Index 19, International Journal of Computer and Information Engineering, 2(7), 2489 - 2492.