“…Pickands (1969), Leadbetter et al (1983), Piterbarg (1996). The extensions of the classic result (3) to more general cases, such as for non-stationary case, strongly dependent case, can be found in Mittal and Ylvisaker (1975), McCormick (1980), McCormick and Qi (2000), Hülser (1990), Konstant and Piterbarg (1993), Seleznjev (1991Seleznjev ( , 1996, Hülser (1999), Hülser et al (2003), Tan et al (2012) and among others. In applied fields, however, the classic result (3) can not be used directly, since the available samples are discrete.…”