1. Lect Notes Comput Sci;C. A. Duncan,1998
2. Lect Notes Comput Sci;P. Eades,1996
3. Lect Notes Comput Sci;P. Eades,1997
4. I. Fary. On straight lines representation of planar graphs. Acta Sci. Math. Szeged, 11:229–233, 1948.
5. Lect Notes Comput Sci;Q.-W. Feng,1995