@article{oai:tsukuba.repo.nii.ac.jp:00015989,
 author = {Garcia-Rio, Eduardo and Vazquez-Abal, Elena M.},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {273--284},
 title = {On the quaternionic sectional curvature of an indefinite quaternionic Kahler manifold},
 volume = {19},
 year = {1995}
}