Fawz Abdul Salam K.AL-Saffar, Abdul Razak K. Mahmood و Najwa I. AL- Barhawi (2023) "Investigation at the molecular level for a nifgenes to bacteria klebsiella pneumoniea the use of polymerase chain reaction (PCR)", Tikrit Journal of Pure Science, 22(3), ص 58–62. doi: 10.25130/tjps.v22i3.712.