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The model has vanishing central charge and contains two anticommuting BRST charges, $Q_{S}=Q_{W} + \\oint \\g^{z} b_{zz} + \\oint \\eta_{z}$ and $Q_{V} = \\oint c^{z} \\Big(T^{W}_{zz} + {1\\over 2} T^{top}_{zz}\\Big) + \\g^{z} (B^{W}_{zz} + {1\\over 2} B^{top"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-th/0307056","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2003-07-07T17:08:59Z","cross_cats_sorted":[],"title_canon_sha256":"7769ceefa8af4045f765b323c72964d4bc0b4de7821aa5ebc640b292a41a2f30","abstract_canon_sha256":"f7ea5a74b2f1a6185ef3b7d0a7a7a82f9788cc1a5f663c64d500ed37d64226a1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:38:46.904950Z","signature_b64":"cyGRJrJwAveT8b07e3uQ3w8Uc4JNEaN9aUMS0V3BAILS82cyH4jEY35ak65xxEgNhpk/cgdt9AvEKJQ52izyDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"98ddbe2706ab866e30f2427d738a0c8c27fd96f3f250f35155f883b8e9f22499","last_reissued_at":"2026-05-18T01:38:46.904486Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:38:46.904486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Quantum Superstring as a WZNW Model with N=2 Superconformal Symmetry","license":"","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Cambridge), G. 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