 A discussion of the role of decoherence in pilot-wave theory in the form suggested above has been given by Rosaler (2015, 2016). An informal discussion is given in Bohm and Hiley (1993, Chapter 8), partial results are given by Appleby  (1999),[25]  and some simulations have been realised by Sanz and co-workers (e.g. Sanz and Borondo  2009).[26]  Relevant results have also been derived by Toroš, Donadi and Bassi (2016) who show quantitative correspondence with a spontaneous collapse model (see also Romano 2016). A rather different approach is instead suggested by Allori (2001; see also Allori and Zanghì  2009).[27]