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Physical Review Letters, vol. 102, no. 18, 2009.
A. M. Childs, Kothari, R., and Somma, R. D.,
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SIAM Journal on Computing, vol. 46, no. 6, pp. 1920-1950, 2017.
A. M. Childs and Strouse, D. J.,
“Levinson's theorem for graphs”,
Journal of Mathematical Physics, vol. 52, no. 8, p. 082102, 2011.