APA (7th ed.) Citation

Tu, J., & Zhou, W. (2011). A factor 2 approximation algorithm for the vertex cover problem. Information processing letters, 111(14), 683-686. https://doi.org/10.1016/j.ipl.2011.04.009

Chicago Style (17th ed.) Citation

Tu, Jianhua, and Wenli Zhou. "A Factor 2 Approximation Algorithm for the Vertex Cover Problem." Information Processing Letters 111, no. 14 (2011): 683-686. https://doi.org/10.1016/j.ipl.2011.04.009.

MLA (9th ed.) Citation

Tu, Jianhua, and Wenli Zhou. "A Factor 2 Approximation Algorithm for the Vertex Cover Problem." Information Processing Letters, vol. 111, no. 14, 2011, pp. 683-686, https://doi.org/10.1016/j.ipl.2011.04.009.