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Umar A, Al Hajry A, Al-Ghamdi AA, Al-Heniti S.Umar A, et al.J Nanosci Nanotechnol. 2010 Oct;10(10):6659-65. doi: 10.1166/jnn.2010.3293.J Nanosci Nanotechnol. 2010.PMID: 21137778
Kim SH, Umar A, Hwang SW, Al-Sayari SA, Abaker M, Al-Hajry A.Kim SH, et al. Among authors: umar a.J Nanosci Nanotechnol. 2011 Jun;11(6):5102-7. doi: 10.1166/jnn.2011.4744.J Nanosci Nanotechnol. 2011.PMID: 21770150
Umar A, Abaker M, Faisal M, Hwang SW, Baskoutas S, Al-Sayari SA.Umar A, et al.J Nanosci Nanotechnol. 2011 Apr;11(4):3474-80. doi: 10.1166/jnn.2011.4148.J Nanosci Nanotechnol. 2011.PMID: 21776726