1. On finite groups whose every proper normal subgroup is a union of a given number of conjugacy classes

   • Ali Reza Ashrafi
   • Geetha Venkataraman

   OriginalPaper Pages: 217 - 224

2. Characteristic properties of large subgroups in primary abelian groups

   • Peter V. Danchev

   OriginalPaper Pages: 225 - 233

3. Multilinear integral operators and mean oscillation

   • Lanzhe Liu

   OriginalPaper Pages: 235 - 251

4. Superstability of the generalized orthogonality equation on restricted domains

   • Soon-Mo Jung
   • Prasanna K. Sahoo

   OriginalPaper Pages: 253 - 267

5. Non-linear second-order periodic systems with non-smooth potential

   • Evgenia H. Papageorgiou
   • Nikolaos S. Papageorgiou

   OriginalPaper Pages: 269 - 298