H. Kamil Jassim, H. Ali Naser, and A. Kleef Jiheel, “A New Efficient Method for solving Helmholtz and Coupled Helmholtz Equations Involving Local Fractional Operators”, UTJsci, vol. 6, no. 4, pp. 153–157, Jun. 2018, doi: 10.32792/utq/utjsci/v6i4.81.