Subhaschandra Singh, S. “Bright and Dark 1– Soliton Solutions to Perturbed Schrodinger – Hirota Equation With Power Law Nonlinearity via Semi – Inverse Variation Method and Ansatz Method”. International Journal of Physical Research, vol. 5, no. 2, June 2017, pp. 39-42, https://doi.org/10.14419/ijpr.v5i2.7795.