
doi: 10.1007/bfb0019431
In this paper, we present results on two subclasses of trapezoid graphs, including simple trapezoid graphs and triangle graphs (also known as PI graph in [3]). Simple trapezoid graphs and triangle graphs are proper subclasses of trapezoid graphs [5, 3]. Here we show that simple trapezoid graphs and triangle graphs are also two distinct subclasses of trapezoid graphs.
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