Twisted Burnside Theory for the Discrete Heisenberg Group and for Wreath   Products of Some Groups
  The RP-property of Fel'shtyn and Troitsky is proved for wreath products of finitely generated Abelian groups with the group of integers. Such wreath products become the first known example of finitely generated RP-groups being not almost polycyclic. 
F.K. Indukaev