Petreska Stanoeva, J., Stefova, E., Cvetanoska, M., & Bogdanov, J. (2022). Establishing mass spectral fragmentation patterns for characterization of 1,2 -unsaturated pyrrolizidine alkaloids and N-oxides in Boraginaceae species from Macedonia using LC-ESI-MS/MS. Macedonian Journal of Chemistry and Chemical Engineering, 41(1), 99–110. https://doi.org/10.20450/mjcce.2022.2491 (Original work published June 19, 2022)