found: Turkish folkpoems [SR] 1978:container (Percussion Group The Hague)
found: Messiaen, O. Des canyons aux étoiles-- [SR] p1994:label (Slagwerkgroep Den Haag) insert (founded in 1977 by four percussion students at the Royal Conservatory in The Hague)
found: Bondt, C. de. Cornelis de Bondt [SR] p1998:insert (Slagwerkgroep Den Haag (Percussion Group The Hague))
found: OCLC database, Jan. 26, 2012(variant: Hague Percussion Ensemble)
found: Dutch Wikipedia, Jan. 26, 2012(Slagwerkgroep Den Haag (SDH); founded 1977; assumed name Slagwerk Den Haag in 2009)
notfound: Inter. WW mus., 8th ed.;Vinton. Dict. 20th cent. mus., 1974;Encyc. van de muz., 1956;Rostand. Dict. mus. contemp., 1970.;Gordon, M. Timber [SR] p2011: label (Slagwerk Den Haag)
