Nagaraj V. Dharwadkar B. B. Amberker Steganographic Scheme for Gray-Level Image Using Pixel Neighborhood and LSB Substitution. 589-607 2010 10 Int. J. Image Graphics 4 http://dx.doi.org/10.1142/S0219467810003901 db/journals/ijig/ijig10.html#DharwadkarA10