Sun, A. et al. 2013. Ultrasonic-Assisted Dispersive Liquid Phase Microextration with Low-Volume Toxic Solvent for the Separation of Strontium and its Application for Strontium Isotope Determination. Asian Journal of Chemistry. 26, 1 (Dec. 2013), 169–172. DOI:https://doi.org/10.14233/ajchem.2014.15366.