H. Yan, K. Li, R. Khatiwada, E. Smith, W. M. Snow, C. B. Fu, P.-H. Chu, H. Gao and W. Zheng. (2014). A Frequency Determination Method for Digitized NMR Signals.
            <i>Communications in Computational Physics</i>. <i>15</i> (5).
            1343-1351.
         doi:10.4208/cicp.110613.270913a