@ARTICLE\{IMM1998-0680,
    author       = "M. Bakr and J. Bandler and R. Biernacki and S. Chen and K. Madsen",
    title        = "A Trust Region Aggressive Space Mapping Algorithm for {EM} Optimization",
    year         = "1998",
    pages        = "2412-2425",
    journal      = "{IEEE} Trans. Microwave Theory Tech.",
    volume       = "MTT-46",
    editor       = "",
    number       = "12",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/680-full.html"
}