Orhorhoro, Ejiroghene Kelly, et al. “Development of a Variance Model for the Prediction of Water Absorption and Thickness Swelling for an Experimental Design Pvc Reinforced Composite Pipes”. Applied Research and Smart Technology (ARSTech), vol. 4, no. 1, Aug. 2023, pp. 16-24, doi:10.23917/arstech.v4i1.1435.