Eyad Alkassar Mark A. Hillebrand Dirk Leinenbach Norbert Schirmer Artem Starostin Alexandra Tsyban Balancing the Load. 389-454 2009 42 J. Autom. Reasoning 2-4 http://dx.doi.org/10.1007/s10817-009-9123-z db/journals/jar/jar42.html#AlkassarHLSST09