Groups of order paqbrc having exactly three conjugacy classes of nonnormal subgroups
CHEN Shunmin 1,2, CHEN Guiyun 3
1. School of Mathematics and Information Science, Shaanxi Normal University, Xian 710062, Shaanxi, China; 2. School of Mathematic and Statistics, Chongqing University of Arts and Sciences, Chongqing 402160, China; 3. School of Mathematics and Statistics, Southwest University, Chongqing 400715, China
