Again and again: reduplication in child phonology. Schwartz, R. G., Leonard, L. B., Wilcox, M. J., & Folger, M. K. J. Child Lang., 7(1):75–87, 1980.
doi  bibtex   
@Article{Schwartz1980,
  author  = {Schwartz, Richard G. and Leonard, Laurence B. and Wilcox, M. Jeanne and Folger, M. Karen},
  journal = {J. Child Lang.},
  title   = {Again and again: reduplication in child phonology},
  year    = {1980},
  number  = {1},
  pages   = {75--87},
  volume  = {7},
  doi     = {10.1017/S0305000900007030},
}

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