S. F. Hwang, W. L. Chao, and C. L. Wu, “A COMPETITIVE ANALYSIS OF IMPROVED COVER-BASED 2-CONNECTED NODE PLACEMENT ALGORITHM FOR THE 2-CONNECTED RELAY NODE PLACEMENT PROBLEM UNDER DELAY CONSTRAINT IN WIRELESS SENSOR NETWORKS”, Research Journal of Agriculture (RJA), vol. 14, no. 12, pp. 9–23, Dec. 2023.