For citations:

Gouda A.A., El Sheikh R., El Sayed H.M., Khedr A.M., Abo Al Ezz Sh., Gamil W., Hamdy M. Ultrasound-Assisted Dispersive Microsolid-Phase Extraction for Preconcentration of Trace Cobalt and Nickel in Environmental Samples Prior to Their Determination by Flame Atomic Absorption Spectrometry. Zhurnal Prikladnoii Spektroskopii. 2022;89(3):433.