Indifference Digraphs: A Generalization of Indifference Graphs and Semiorders. - Malay K. Sen; Barun K. Sanyal (SIAM J. Discret. Math., 1994)

Representing digraphs using intervals or circular arcs. - Malay K. Sen; Barun K. Sanyal; Douglas B. West (Discret. Math., 1995)

New characterizations of digraphs represented by intervals. - Barun K. Sanyal; Malay K. Sen (J. Graph Theory, 1996)