Algorithms Circular-arc graphs Circular-arc graph Graphic methods Helly circular-arc graphs Proper circular-arc graphs Approximation theory Arc models Characterization Circular-ones property Clustering algorithms Forbidden induced subgraphs Forbidden subgraphs Forestry General class Graph algorithms Graph class Graph isomorphism Graph theory Intersection graph Interval graph Linear-time Linear-time algorithms Mathematical models Matrix isomorphism PC tree Polynomial recognition Polynomials Principal component analysis Recognition algorithm