Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hirai Shizuko and Okazaki Masako and Morinushi Takanobu and Ogura Tadashi,A Preparatory Study on the Changing of the Mandibular Movement based on Hellman's Dental Stage,The Japanese Journal of Pediatric Dentistry,0583-1199,The Japanese Society of Pediatric Dentistry,1987,25,2,345-352,https://cir.nii.ac.jp/crid/1390282679662490496,https://doi.org/10.11411/jspd1963.25.2_345