In this regard, we refer to the works of Pironneau (1984), Haslinger and Neittaanmaki (1988), (1996), Sokolowski and Zolksio (1992), Litvinov (2000), Allaire (2001), Mohammadi and Pironneau (2001), Delfour and Zolksio (2001), and Makinen and Haslinger (2003).