@article{oai:tsukuba.repo.nii.ac.jp:00016130,
 author = {Li, Zhi-Bo},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {397--407},
 title = {Harmonic foliations on the sphere},
 volume = {15},
 year = {1991}
}