MOLLIN, R. A., & WALSH, P. G. (1986). ON POWERFUL NUMBERS. International Journal of Mathematics and Mathematical Sciences, 1986(), 801-806. https://doi.org/10.1155/S0161171286000984
Lin, Y. (2022). Stop Being Worried, Just Speak Up. International Journal of Social Science and Education Research, 5(3), 565-571. https://doi.org/10.6918/IJOSSER.202203_5(3).0095