@article{Ahmed202029 title = "Quantification and Comparison of Opium (Morphine) and Tramadol from Biological Samples "Liquid - Liquid Extraction"", journal = "Journal of New Developments in Chemistry", volume = "2", number = "4", pages = "29 - 34", year = "2020", note = "", issn = "2377-2549", doi = "https://doi.org/10.14302/issn.2377-2549.jndc-20-3413", url = "https://jndc-chemistryarticles.infojndc/article/1408", author = "M.A. Shihata Ahmed and ELESSAWY A.M. and M. Elanwer Alaa", keywords = "Morphine", keywords = "Tramadol", keywords = "Extraction", keywords = "GC-MS." }