They are listed here sequentially and I'd suggest reading them in order before diving into the last one directly if you don't already know what EC means.
A Closer Look at Bitcoin Unlimited's Configurable Block Size Proposal
How Bitcoin Unlimited Users May End Up on Different Blockchains
https://bitcoinmagazine.com/articles/how-bitcoin-unlimited-users-may-end-different-blockchains/
Why Bitcoin Unlimited's "Emergent Consensus" Is a Gamble
https://bitcoinmagazine.com/articles/why-bitcoin-unlimiteds-emergent-consensus-gamble/
submitted by /u/wintercooled
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