@book{UBHD-1434805, title={Main reports and invited papers}, publisher={Excerpta Medica Foundation}, address={Amsterdam}, year={1968}, language={eng}, number={ARRAY(0x5647f0cb1880)}, series={Les congrès et colloques de l'Université de Liège}, library={UB [Signatur: 68 B 2064::1]}, }