Design & Development of Rule Based Inflectional and Derivational Urdu Stemmer ‘Usal’

https://www.researchgate.net/profile/Vaishali_Gupta7/publication/273127103_Design__Development_of_Rule_Based_Inflectional_and_Derivational_Urdu_Stemmer_'Usal'/links/54f831210cf28d6deca0853a.pdf

A Rule based Stemming Method for Multilingual Urdu Text

http://www.ijcaonline.org/research/volume134/number8/ali-2016-ijca-907784.pdf

Assas-Band, an Affix-Exception-List Based Urdu Stemmer

http://www.aclweb.org/anthology/W09-34#page=50