Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kumagai Takayuki,A Theoretical Examination of the Formation of Triadic Relations Preceding the Development of 'Theory of Mind' : Manifestation of Symptoms in Children with Autism.,The Japanese Journal of Developmental Psychology,09159029,Japan Society of Developmental Psychology,2004,15,1,77-88,https://cir.nii.ac.jp/crid/1390282680717918080,https://doi.org/10.11201/jjdp.15.77