http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Development of emotion expression during the first two years of life
Carol Z. Malatesta [and others] ; with commentary by Alan Fogel and Mark Reimers, Gail Zivin, and a reply by the authors.
Monographs of the Society for Research in Child Development. vol.54, no.1-2