Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Björn Anders and Björn Jana,Boundary regularity for p-harmonic functions and solutions of the obstacle problem on metric spaces,Journal of the Mathematical Society of Japan,00255645,The Mathematical Society of Japan,2006,58,4,1211-1232,https://cir.nii.ac.jp/crid/1390282680093311232,https://doi.org/10.2969/jmsj/1179759546