Interval Digraphs and Bounded Bitolerance Digraphs
Interval digraphs and bounded bitolerance digraphs are two
different directed graph analogues to the well-known interval graphs.
Both are contained in the class of digraphs of Ferrers Dimension
at most two. In this paper we explore the relationship between
these two important classes of digraphs.
Interval digraphs and bounded bitolerance digraphs, Congressus Numerantium Vol. 151, 111-127 (2001).