@article {87031,
	title = {Collaborative partner or social tool? New evidence for young children{\textquoteright}s understanding of joint intentions in collaborative activities},
	journal = {Developmental Science},
	volume = {15},
	number = {1},
	year = {2012},
	pages = {54-61},
	author = {Warneken, F. and Gr{\"a}fenhain, M. and Tomasello, M.}
}
