title: [Not Available].
authors.affiliation: Dr. Dietrich Steinkopff Verlag, Poststraße 9, D-64293 Darmstadt Telefon 06151/82899-22 Telefax 06151/82899-40 E-Mail: scheffler.steinkopff@springer.de www.steinkopff.springer.de, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Scheffler