Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAHASHI Hideaki and KUMAGAI Hitoshi and NAGAYAMA Masaichi,Estimation of the microstructure of anodic porous oxide films on aluminum by the pore-filling method I. Analysis of film structure formed by two-step anodizing.,Journal of the Metal Finishing Society of Japan,0026-0614,The Surface Finishing Society of Japan,1985,36,11,478-482,https://cir.nii.ac.jp/crid/1390282679088161280,https://doi.org/10.4139/sfj1950.36.478