BibTeX
@BOOK{
         Haftka1992EoS,
       author = "Raphael T. Haftka and Zafer G{\"u}rdal",
       title = "Elements of Structural Optimization",
       publisher = "Kluwer Academic Publishers",
       address = "Dordrecht",
       key = "Haftka1992EoS",
       referred = "[Dignath2001AAa].",
       year = "1992"
}