@article{oai:tsukuba.repo.nii.ac.jp:00016023,
 author = {Sekiguchi, Tsutomu and Suwa, Noriyuki},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {459--487},
 title = {A case of extensions of group schemes over a discrete valuation ring},
 volume = {14},
 year = {1990}
}