Hervé Moulin
The separability axiom and equal-sharing methods
http://www.sciencedirect.com/science/article/B6WJ3-4CYGDDC-166/2/3fc80ecd150fb54f49bcfb8627a0f3bd

William Thomson
Consistent extensions
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V88-4582BX8-4&_user=2307323&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000056859&_version=1&_urlVersion=0&_userid=2307323&md5=d5e5fb4722a858a9a2293dc357f5d540