Geodesic
Graphs with the Reduced Spectrum in the Unit Interval
Publications de l'Institut Mathématique, _N_S_36 (1984) no. 50, p. 17 .

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By the reduced spectrum (r.s.) of a finite connected graph, we mean the set of all its eigenvalues with the maximal and the minimal eigenvalues excluded. In this paper we characterize all finite connected graphs having at least one positive and at least one negative eigenvalue in their reduced spectrum, whose r.s. lies in the unit interval $[-1,1)$.
Classification : 05C50 47A10 
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     author = {Aleksandar Torga\v{s}ev},
     title = {Graphs with the {Reduced} {Spectrum} in the {Unit} {Interval}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {17 },
     publisher = {mathdoc},
     volume = {_N_S_36},
     number = {50},
     year = {1984},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1984_N_S_36_50_a3/}
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Aleksandar Torgašev. Graphs with the Reduced Spectrum in the Unit Interval. Publications de l'Institut Mathématique, _N_S_36 (1984) no. 50, p. 17 . http://geodesic.mathdoc.fr/item/PIM_1984_N_S_36_50_a3/