Automatic recognition and analysis of human faces and facial expressions: a survey. - Ashok Samal; Prasana A. Iyengar (Pattern Recognit., 1992)

Natural shape detection based on principal component analysis. - Ashok Samal; Prasana A. Iyengar (J. Electronic Imaging, 1993)

Human Face Detection Using Silhouettes. - Ashok Samal; Prasana A. Iyengar (Int. J. Pattern Recognit. Artif. Intell., 1995)