@Article{,
AUTHOR = {Deli Gao},
TITLE = {Preface},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {89},
YEAR = {2012},
NUMBER = {2},
PAGES = {0--0},
URL = {http://www.techscience.com/CMES/v89n2/33730},
ISSN = {1526-1506},
ABSTRACT = {This article has no abstract.},
DOI = {}
}