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Superstring theory - Wikipedia
[hep-th/9709062] Introduction to Superstring Theory - arXiv.org
34.3 Superstrings - College Physics 2e | OpenStax
34.3: Superstrings - Physics LibreTexts
History of string theory - Wikipedia
Introduction to Superstrings and M-Theory | SpringerLink
Why String Theory Still Offers Hope We Can Unify Physics
The Elegant Universe | NOVA | PBS
[hep-ex/0008017] Introduction to Superstring Theory - arXiv.org