Economists’ Mathematical Manual - Sydster, Knut; Berck, Peter; Strom, Arne; Strøm, Arne; Sydsaeter, Knut; StrÃ¸m, Arne; SydsÃ¦ter, Knut; Strxm, Arne; Sydsfter, Knut (Springer Berlin Heidelberg, 2005)