Supergravity Solutions Without Tri-holomorphic U(1) Isometries
  We investigate the construction of five-dimensional supergravity solutions that don't have any tri-holomorphic U(1) isometries. We construct a class of solutions that in various limits of parameters reduces to many of previously constructed five-dimensional supergravity solutions based on both hyper-Kahler base spaces that can be put into a Gibbons-Hawking form and hyper-Kahler base spaces that can't be put into a Gibbons-Hawking form. We find a new solution which is over triaxial Bianchi type IX Einstein-hyperkahler base space with no tri-holomorphic U(1) symmetry. One special case of this solution corresponds to five-dimensional solution based on Eguchi-Hanson type II geometry. 
A. M. Ghezelbash