Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Shibuya Kazuhiro,On the prolongation of 2-jet space off 2 independent and 1 dependent variables,Hokkaido University Preprint Series in Mathematics,,"Department of Mathematics, Hokkaido University",2008-09-01,926,,1-25,https://cir.nii.ac.jp/crid/1390853649725557632,https://doi.org/10.14943/84075