"congresses and meetings D-F"@en . "congrès et journées d'études D-F"@fr . "congressi, convegni, giornate di studio D-F"@it . "Kongresse und Tagungen D-F"@de . . . . "Dušanbe 1968 (xPraxKongrD-F)"@de . . "Dušanbe 1968"@de . .