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2. Assessing the human-animal bond: a compendium of actual measures;Anderson,2007
3. The ties that do not bind: A study of human-animal bonds that fail;Arkow,1984
4. The nature of the child’s tie to his mother;Bowlby;Int. J. Psycho-analysis,1958
5. Attachment and loss. Vol. I: Attachment;Bowlby,1969