1. Unimodularity of the Clar number problem;Abeledo;Linear Algebra and its Applications,2007
2. Polyhedral combinatorics of benzenoid problems;Abeledo,1998
3. The Clar and Fries problems for benzenoid hydrocarbons are linear programs;Abeledo,2000
4. The Aromatic Sextet;Clar,1972
5. Kekulé Structures in Benzenoid Hydrocarbons;Cyvin,1988