Progress in Particle and Nuclear PhysicsVolume 19, 1987, Pages 1-31What are string theories?Author links open overlay panelH. NicolaiShow moreShareCitehttps://doi.org/10.1016/0146-6410(87)90002-0Get rights and contentAbstractRecent developments in string and superstring theory are reviewed at an introductory level.Recommended articlesReferences (7)V. Alessandrini et al.Phys. Rep.(1971)S. MandelstamPhys. Rep.(1974)C. RebbiPhys. Rep.(1974)There are more references available in the full text version of this article.Cited by (0)View full textCopyright © 1987 Published by Elsevier B.V.