On some Lie groups as 5-dimensional almost contact B-metric manifolds   with three natural connections
  Almost contact manifolds with B-metric are considered. There are studied three natural connections (i.e. linear connections preserving the structure tensors) determined by conditions for their torsions. These connections are investigated on a family of Lie groups considered as 5-dimensional almost contact B-metric manifolds. 
Miroslava Ivanova, Hristo Manev
math.DG