Mahmoodzadeh, Azar, Agahi, Hamed, Salehi , Marzieh . “Handwritten Digits Recognition Using an Ensemble Technique Based on the Firefly Algorithm.” Journal of Information Systems and Telecommunication (JIST) , vol. 6, no. 23, 2019, pp. 136-149. 10.7508/jist.2018.03.003