Karthikevan, R. & Babu, N.K.C. & Mandal, A.B. & Sehgal, P.K. (2011)
A new depigmentation and fiber opening method for the conversion of stingray skins into leathers. Journal of the American Leather Chemists Association, 106, 25–32

Karthikevan, R. & Babu, N.K.C. & Mandal, A.B. & Sehgal, P.K. (2009)
Soft leathers from Himantura stingray skin. Journal of the Society of Leather Technologists and Chemists, 93, 108–113