Corpus: UAM Spanish TreeBank. Domain: News.
Annotation guidelines (pages 51-55): http://www.lllf.uam.es/ESP/pdf/Moreno&Garrote_RIL8_2013.pdf
Reference: Sandoval, A. M., & Salazar, M. G. (2013). La anotación de la negación en un corpus escrito etiquetado sintácticamente. Revista Iberoamericana de Lingüística: RIL, (8), 45-60.

Corpus: IxaMed-GS. Domain: Clinical reports.
Annotation guidelines (page 322): https://doi.org/10.1016/j.jbi.2015.06.016
Reference: Oronoz, M., Gojenola, K., Pérez, A., de Ilarraza, A. D., & Casillas, A. (2015). On the creation of a clinical gold standard corpus in spanish: Mining adverse drug reactions. Journal of biomedical informatics, 56, 318-332.

Corpus: SFU ReviewSP-NEG. Domain: Product reviews.
Annotation guidelines (pages 6-27): https://doi.org/10.1007/s10579-017- 9391-x
Reference: Jiménez-Zafra, S. M., Taulé, M., Martín-Valdivia, M. T., Ureña- López, L. A., & Martí, M. A. (2017). SFU ReviewSP-NEG: a Spanish corpus annotated with negation for sentiment analysis. A typology of negation patterns. Language Resources and Evaluation, 1-37.

Corpus: UHU-HUVR. Domain: Clinical reports.
Annotation guidelines (pages 54-57): http://www.aclweb.org/anthology/W17-1808
Reference: Cruz, N., Morante, R., López, M. J. M., Vázquez, J. M., & Calderón, C. L. P. (2017). Annotating Negation in Spanish Clinical Texts. In Proceedings of the Workshop Computational Semantics Beyond Events and Roles (pp. 53-58).

Corpus: IULA Spanish Clinical Record. Domain: Clinical reports.
Annotation guidelines (pages 45-49): http://www.aclweb.org/anthology/W17-1807
Reference: Marimon, M., Vivaldi, J., & Bel, N. (2017). Annotation of negation in the IULA Spanish Clinical Record Corpus. In Proceedings of the Workshop Computational Semantics Beyond Events and Roles (pp. 43-52).