Development and Validation of a UHPLC-ESI-MS/MS Method for Quantification of Oleandrin and Other Cardiac Glycosides and Evaluation of Their Levels in Herbs and Spices from the Belgian Market, Malysheva, Svetlana V., Mulder Patrick P. J., and Masquelier Julien , Toxins, 9 april 2020, Volume 12, Issue 4, Number 259, (2020)