Petreska Stanoeva, J., Stefova, E., Cvetanoska, M. and 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), pp. 99–110. doi: 10.20450/mjcce.2022.2491.