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http://rsta.royalsocietypublishing.org/content/375/2108/20160431 (Publisher version)
Devakul, T., Khemani, V., Pollmann, F., Huse, D. A., & Sondhi, S. L. (2017). Obtaining highly excited eigenstates of the localized XX chain via DMRG-X. Philosophical Transactions of the Royal Society of London - Series A: Mathematical Physical and Engineering Sciences, 375(2108): 20160431. doi:10.1098/rsta.2016.0431.