@ARTICLE {4590,
author={R.  Aguiar},
doi={},
journal={UNKNOWN JOURNAL - TEMPORARY ONLY UNTIL PAPERS ARE CORRECTLY ASSOCIATED - NOT SUITABLE FOR PRODUCTIVITY INDEX},
title={Some comments on hourglasses},
year={2008},
month={October},
volume={38},
number={N/A},
pages={69-72},
ISSN={}
}