||Although Kripke 1980 will surely remain the classic on the topic of metaphysical necessity, more recent discussion is abundant. For a discussion of the relationship between different types of necessity and the idea that narrower notions of necessity could be defined by restriction of metaphysical necessity, see Fine 2002. Fine 1994 presents an influential case in favour of reducing metaphysical necessity to essence, different aspects of which have since been discussed, e.g., in Hale 1996, Shalkowski 1997, Lowe 1998, Zalta 2006, Cameron 2010, and Correia 2012. For discussion on Kripke's and Putnam's contributions to the literature, see for instance Edgington 2004, Soames 2011, Ballarin 2013, and Tahko 2013. Rosen 2006 argues that more than one notion fits Kripke's characterization of metaphysical necessity and his key examples. Divers 2018 argues for a form of 'pragmatic scepticism' about the notion.