@article{oai:tsukuba.repo.nii.ac.jp:00015889,
 author = {Sekizawa, Masami},
 issue = {1},
 journal = {Tsukuba Journal of Mathematics},
 month = {Jun},
 pages = {115--128},
 title = {Natural transformations of vector fields on manifolds to vector fields on tangent bundles},
 volume = {12},
 year = {1988}
}