David Bowie | David Lynch | David | Late Show with David Letterman | David Cameron | David Beckham | David Lloyd George | David Hume | David Hockney | David Letterman | David Byrne | David J. Eicher | David Mamet | David Foster | Late Night with David Letterman | David Ben-Gurion | Jacques-Louis David | David Guetta | David Carradine | Henry David Thoreau | David Tennant | David Niven | David Essex | David A. Stewart | David Sanborn | David Livingstone | David Garrick | David Crosby | David Attenborough | David Souter |
The classic 1976 work of Ferdinando Gliozzi, Joel Scherk and David Olive paved the way to a systematic understanding of the rules behind string spectra in cases where only closed strings are present via modular invariance but did not lead to similar progress for models with closed strings, despite the fact that the original discussion was based on the type I string theory.