Classical and strongly classical 2-absorbing second submodules
  In this paper, we will introduce the concept of classical (resp. strongly classical) 2-absorbing second submodules of modules over a commutative ring as a generalization of 2-absorbing (resp. strongly 2-absorbing) second submodules and investigate some basic properties of these classes of modules. 
H. Ansari-Toroghy and F. Farshadifar
math.AC