@article{oai:tsukuba.repo.nii.ac.jp:00017252,
 author = {Ichiyama, Toshiyuki and Furuhata, Hitoshi and Urakawa, Hajime},
 issue = {3},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {551--564},
 title = {A conformal gauge invariant functional for Weyl structures and the first variation formula},
 volume = {23},
 year = {1999}
}