Kirov, Todor, Lina Malinova, Dimitrinka Atanasova, and Nikolai Lazarov. 2023. “Localization of Substance P-Immunoreactive Nerve Structures in the Rat Colon”. Proceedings of the Bulgarian Academy of Sciences 76 (5). Sofia, Bulgaria:796–802. https://doi.org/10.7546/CRABS.2023.05.16.