@techreport{TR-DCC-93-14,
  number = {DCC-93-14},
  author = {Oliveira, Lincoln M. and Medeiros, Claudia M. B.},
  title = {Managing Time in Object-Oriented Databases},
  month = {July},
  year = {1993}, 
  institution = {Department of Computer Science, University of Campinas},
  note = {In English, 29 pages.
    \par\selectlanguage{english}\textbf{Abstract}
      This paper presents a new approach for modelling and querying
      temporal object oriented databases.  The model presented in this
      paper extends previous work in the area, by supporting the
      evolution of all object properties through time (inheritance,
      composition and behavior), and allowing temporal schema evolution.
      A prototype of this model is being implemented as a time-managing
      layer on top of the O2 object-oriented database system.  In order
      to manipulate our temporal objects, we have extended the O2 query
      language with temporal constructs, which we also discuss in the
      paper.
  }
}