1. Bonchev D., Rouvray D.H.: Complexity in Chemistry—Introduction and Fundamentals. Taylor and Francis, London (2005)
2. Lukovits I., Nikolić S., Trinajstić N.: Int. J. Quantum Chem. 71, 217 (1999)
3. Lukovits I., Nikolić S., Trinajstić N.: Croat. Chem. Acta 73, 957 (2000)
4. Fowler P.W.: Croat. Chem. Acta 75, 401 (2002)
5. Nikolic S., Trinajstic N., Juric A., Mihalic Z., Krilov G.: Croat. Chem. Acta 69, 883 (1996)