Lu , JianAlzahrani , Jawaher H. and Jiang , Qingtang. (2021). A Second-Order Synchrosqueezing Transform with a Simple Form of Phase Transformation.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>14</i> (3).
            624-649.
         doi:10.4208/nmtma.OA-2020-0077