@article{oai:ynu.repo.nii.ac.jp:00006938,
 author = {Yamaura, Yoshihiko},
 issue = {1},
 journal = {Yokohama Mathematical Journal = 横濱市立大學紀要. D部門, 数学},
 month = {},
 note = {application/pdf, The free boundary problem with the area functional is investigated. A priori estimate for the measure of the caved part of the set where the function is zero is obtained, so that a convex property of the free boundary is established.},
 pages = {1--16},
 title = {A PRIORI ESTIMATE ON THE FREE BOUNDARY PROBLEM AND ITS APPLICATION},
 volume = {47},
 year = {1999}
}