A. Kar, D. Bhattacharjee, D. K. Basu, M. Nasipuri, M. Kundu, (2011). “An Adaptive Block-based Integrated LDP, GLCM, and Morphological Features for Face Recognition”, International Journal of Research and Reviews in Computer Science, Vol. 2, No. 5, pp. 1225-1211.
 Ambika Ramchandra, Ravindra Kumar, (2013).
Overview of Face Recognition System
Challenges, INTERNATIONAL JOURNAL OF
SCIENTIFIC & TECHNOLOGY RESEARCH
VOLUME 2, ISSUE 8.
 R. Verma and M.Y. Dabbagh, (2012). “Fast Facial Expression Recognition based on Local Binary Patterns”, 62th Annual IEEE Canadian Conference on Electrical and Computer Engineering (CCECE), pp. 1-4.
 Krishnakant Kishore, Vinit Kumar Gunjan, Gautam Bommagani , poorva Paidipelli, Pooja (2013). “Design, Implementation and Evaluation of an Algorithm for Face Recognition Based on
Modified Local Directional PatternFace
Recognition using LDP5 “International Journal of
Engineering Research Technology (IJERT)Vol. 2
 Taskeed Jabid, Md. Hasanul Kabir, and Oksam Chae (2010). “Robust Facial Expression Recognition Based on Local Directional Pattern”, vol. 32, no., pp. 784-794, 5