“…These papers include Cakici, Chan, and Topyan (), Chen et al (), Carpenter et al (), Wang and Xu (), Cakici, Chatterjee, and Topyan (), Hilliard and Zhang (), Cheung et al (), Wang and Di Iorio (), Wong et al (), Wu (), Eun and Huang (), Huang and Yang (), Chen et al (), Morelli (), and so forth. We will discuss these papers in more detail later.…”