Mochizuki, A., Nakazawa, H., Adachi, N., Takekawa, K., & Shojo, H. Identification and quantification of mepirapim and acetyl fentanyl in authentic human whole blood and urine samples by GC-MS/MS and LC-MS/MS. Forensic Toxicology, 36(1), 81-87. https://doi.org/10.1007/s11419-017-0384-7 (Original work published 2018)