A new Bitfury white paper aims to advance the study of how bitcoins sent using certain privacy-enhancing techniques could be traced back to participants.
Released today, "Shared Send Untangling in Bitcoin" explores how bitcoins in this type of transaction can be "untangled", or sorted into their “original” value flows. Shared send transactions originate when users organize into groups, by way of an intermediary, in order to obfuscate how funds may be moving between wallets.
http://www.coindesk.com/bitfury-research-seeks-shine-light-bitcoin-mixing-methods/
