Yao, S.- sheng and Huang, N.- jing 2014. A Class of Quasistatic Contact Problems for Viscoelastic Materials with Nonlocal Coulomb Friction and Time-Delay. Mathematical Modelling and Analysis. 19, 4 (Sep. 2014), 491-508. DOI:https://doi.org/10.3846/13926292.2014.956354.