@article{oai:tsukuba.repo.nii.ac.jp:00029681, author = {Haraguchi, Yuki}, issue = {2}, journal = {Tsukuba Journal of Mathematics}, month = {Dec}, pages = {405--435}, title = {On non-commutative extensions of G_a by G_m over an F_p -algebra}, volume = {29}, year = {2005} }