1. PI index of armchair polyhex nanotubes;Ashrafi;Ars. Combinatoria,2006
2. PI index of zig-zag polyhex nanotubes;Ashrafi;MATCH-Commun. Math. Co.,2006
3. A.R. Ashrafi, M. Mirzargar, Pi Szeged and edge Szeged indices of an infinite family of nanostrar dendrimers, Indian J. Chem., 47(A) (288) 538-541.
4. Computing eccentric connectivity index of a class of nanostar dendrimers;Ashrafi;Kragujevac J. Sci.,2012
5. Computing the Wiener index of a TUC4C8(S) nanotorus;Ashrafi;MATCH-Commun. Math. Co.,2007