Quasi-Kaehler manifolds with a pair of Norden metrics
  The basic class of the non-integrable almost complex manifolds with a pair of Norden metrics are considered. The interconnections between corresponding quantities at the transformation between the two Levi-Civita connections are given. A 4-parametric family of 4-dimensional quasi-Kaehler manifolds with Norden metric is characterized with respect to the associated Levi-Civita connection. 
Dimitar Mekerov, Mancho Manev, Kostadin Gribachev