2004

1. On the number of conjugacy classes of zeros of characters

   Israel Journal of Mathematics, Vol. 142, pp. 163-187

2. On the number of zeros in the columns of the character table of a group

   Journal of Algebra, Vol. 279, Núm. 2, pp. 726-736

3. Sylow subgroups and the numbers of conjugacy classes of p-elements

   Journal of Algebra, Vol. 275, Núm. 2, pp. 668-674