@article{145104,
      note = {Includes bibliographical references.},
      url = {http://digitallibrary.un.org/record/145104},
      title = {World population monitoring 1991, with special emphasis on  age structure.},
      publisher = {UN,},
      recid = {145104},
      pages = {xii, 241 p. :},
      address = {New York :. 1992},
      year = {1992},
}