@book{UBHD-1046654, publisher={Habelt}, address={Bonn}, year={1974}, pages={152 S.}, language={ger}, number={ARRAY(0x559bea23e5c0)}, series={Habelts Dissertationsdrucke}, library={UB [Signatur: 75 A 1744] ; AC [Signatur: M 812]}, }