2 citations to https://www.mathnet.ru/rus/tmf1318
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NORMAN E. HURT, “THE PRIME GEODESIC THEOREM AND QUANTUM MECHANICS ON FINITE VOLUME GRAPHS: A REVIEW”, Rev. Math. Phys., 13:12 (2001), 1459
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Л. О. Чехов, “Спектральная задача на графах и $L$-функции”, УМН, 54:6(330) (1999), 109–148 ; L. O. Chekhov, “A spectral problem on graphs and $L$-functions”, Russian Math. Surveys, 54:6 (1999), 1197–1232