Qiang Zhu Satyanarayana Motheramgari Yu Sun Cost Estimation for Queries Experiencing Multiple Contention States in Dynamic Multidatabase Environments. 26-49 2003 5 Knowl. Inf. Syst. 1 http://dx.doi.org/10.1007/s10115-002-0070-9 db/journals/kais/kais5.html#ZhuMS03