The perception of structure in vectorpatterns by 4-month-old infants
Canadian Journal of Psychology/Revue Canadienne de Psychologie (1988) - Comment
doi: 10.1037/h0084179  issn: 0008-4255  pubmed: 3167702 

G. Keith Humphrey, Darwin W. Muir, Peter C. Dodwell, Diane E. Humphrey