What literature is available on who will be given moral consideration in a superintelligence's coherent extrapolated volition (CEV), and how much weight each agent will be given?

Nick Bostrom's Superintelligence mentions that it is an open problem as to whether AIs, non-human animals, currently deceased people, etc should be given moral consideration, and whether the values of those who aid in creating the superintelligence should be given more weight than that of others. However, Bostrom does not actually answer these questions, other than slightly advocating everyone being given equal weight in the CEV. The abstracts of other papers on CEV don't mention this topic, so I am doubtful on the usefulness of reading their entireties.