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4. G.R. Sinha, Indian sign language (ISL) biometrics for hearing and speech impaired persons: Review and recommendation. Int. J. Inf. Technol. 9(4), 425–430 (2017)
5. S.B. Patil, G.R. Sinha, Distinctive Feature Extraction for Indian Sign Language (ISL) Gesture using Scale Invariant Feature Transform (SIFT). J. Inst. Eng. India Ser. B 98, 19–26 (2017). https://doi.org/10.1007/s40031-016-0250-8