7Th International Meeting On Ferroelectricity ( Imf 7 ), Date: AUG 28-SEP 01, 1989, Location: SAARBRUCKEN, FED REP GER, Sponsors: INT UNION PURE & APPL PHYS, EUROPEAN PHYS SOC, GERMAN PHYS SOC, DEUT FORSCHUNGSGEMEINSCH, DEUT AKAD AUSTAUSCHDIENST, MINIST CULTURE EDUC & SCI SAARLAND, GORDON & BREACH SCI PUBL, SIEMENS, IBM STIFTUNGSFONDS STIFTERVERBAND, HUBER DIFFRAKTIONSTECH