ThirdEditionSungNokChiuDepartmentofMathematics,HongKongBaptistUniversity,HongKongDietrichStoyanInstitutf¨urStochastik,TUBergakademieFreiberg,GermanyWilfridS.KendallDepartmentofStatistics,UniversityofWarwick,UKJosephMeckeInstitutf¨urStochastikFriedrich-Schiller-Universit¨atJena,Germany