Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI)
BRACKEN Paul,THE CARTAN FORM AND THE INVERSE PROBLEM IN THE CALCULUS OF VARIATIONS,Tensor. New series,00403504,,2002-04-01,63,1,51-60,https://cir.nii.ac.jp/crid/1571135649938232448,