N. S. Mohamad Rodzi, N. S. Azahari, and N. Z. Harun, “PROTOCOL EFFICIENCY USING MULTIPLE LEVEL ENCODING IN QUANTUM SECURE DIRECT COMMUNICATION PROTOCOL”, IJSECS, vol. 9, no. 2, pp. 105–118, Oct. 2023, doi: 10.15282/ijsecs.9.2.2023.4.0115.