P. Viswanathan, A. K. B. Chand and K. R. Tyada. (2017). Lacunary Interpolation by Fractal Splines with Variable Scaling Parameters.
            <i>Numerical Mathematics: Theory, Methods and Applications</i>. <i>10</i> (1).
            65-83.
         doi:10.4208/nmtma.2017.m1514