EP1061044-A1  AJAYAN P M ET AL: "GROWTH MORPHOLOGIES DURING COBALT-CATALYZED SINGLE-SHELL CARBON NANOTUBE SYNTHESIS" CHEMICAL PHYSICS LETTERS,NL,AMSTERDAM, vol. 215, no. 5, 10 December 1993 (1993-12-10), pages 509-517, XP000677222;  DEMONCY N ET AL: "Filling carbon nanotubes with metals by the arc-discharge method: the key role of sulfur" EUROPEAN PHYSICAL JOURNAL B, AUG. 1998, EDP SCIENCES;SPRINGER-VERLAG, FRANCE, vol. 4, no. 2, pages 147-157, XP000951420 ISSN: 1434-6028;  JYUN-HWEI HWANG ET AL: "Well-aligned carbon nanotubules" ADVANCED MATERIALS, SEPT. 1993, GERMANY, vol. 5, no. 9, pages 643-646, XP000388216 ISSN: 0935-9648;  LIU, C. ET AL: "Hydrogen storage in single-walled carbon nanotubes at room temperature" SCIENCE (WASHINGTON, D. C.) (1999), 286(5442), 1127-1129 , 5 November 1999 (1999-11-05), XP002148937;  LIU, C. ET AL: "Semi-continuous synthesis of single-walled carbon nanotubes by a hydrogen arc discharge method" CARBON (1999), 37(11), 1865-1868 , 1999, XP000946280;  WANG X K ET AL: "CARBON NANOTUBES SYNTHESIZED IN A HYDROGEN ARC DISCHARGE" APPLIED PHYSICS LETTERS,US,AMERICAN INSTITUTE OF PHYSICS. NEW YORK, vol. 66, no. 18, 1 May 1995 (1995-05-01), pages 2430-2432, XP000507611 ISSN: 0003-6951;  ZHAO X ET AL: "Preparation of high-grade carbon nanotubes by hydrogen arc discharge" CARBON,US,ELSEVIER SCIENCE PUBLISHING, NEW YORK, NY, vol. 35, no. 6, 1997, pages 775-781, XP004073597 ISSN: 0008-6223EP1061044-B1  AJAYAN P M ET AL: "GROWTH MORPHOLOGIES DURING COBALT-CATALYZED SINGLE-SHELL CARBON NANOTUBE SYNTHESIS" CHEMICAL PHYSICS LETTERS,NL,AMSTERDAM, vol. 215, no. 5, 10 December 1993 (1993-12-10), pages 509-517, XP000677222;  DEMONCY N ET AL: "Filling carbon nanotubes with metals by the arc-discharge method: the key role of sulfur" EUROPEAN PHYSICAL JOURNAL B, AUG. 1998, EDP SCIENCES;SPRINGER-VERLAG, FRANCE, vol. 4, no. 2, pages 147-157, XP000951420 ISSN: 1434-6028;  JYUN-HWEI HWANG ET AL: "Well-aligned carbon nanotubules" ADVANCED MATERIALS, SEPT. 1993, GERMANY, vol. 5, no. 9, pages 643-646, XP000388216 ISSN: 0935-9648;  LIU, C. ET AL: "Hydrogen storage in single-walled carbon nanotubes at room temperature" SCIENCE (WASHINGTON, D. C.) (1999), 286(5442), 1127-1129 , 5 November 1999 (1999-11-05), XP002148937;  LIU, C. ET AL: "Semi-continuous synthesis of single-walled carbon nanotubes by a hydrogen arc discharge method" CARBON (1999), 37(11), 1865-1868 , 1999, XP000946280;  WANG X K ET AL: "CARBON NANOTUBES SYNTHESIZED IN A HYDROGEN ARC DISCHARGE" APPLIED PHYSICS LETTERS,US,AMERICAN INSTITUTE OF PHYSICS. NEW YORK, vol. 66, no. 18, 1 May 1995 (1995-05-01), pages 2430-2432, XP000507611 ISSN: 0003-6951;  ZHAO X ET AL: "Preparation of high-grade carbon nanotubes by hydrogen arc discharge" CARBON,US,ELSEVIER SCIENCE PUBLISHING, NEW YORK, NY, vol. 35, no. 6, 1997, pages 775-781, XP004073597 ISSN: 0008-6223