Geodesic
Metrically regular square of metrically regular bigraphs. II.
Archivum mathematicum, Tome 28 (1992) no. 1-2, pp. 17-24.

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Metrically regular bigraphs the square of which are metrically regular graphs are investigated in the case of graphs with 6 distinct eigenvalues (these eigenvalues can have variuos multiplicities).
Classification : 05C25, 05C50, 05E30
Keywords: spectra of graphs; squares of graphs; bipartite graphs; metrically regular graphs (MRG); association scheme 
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     author = {Vetch\'y, Vladim{\'\i}r},
     title = {Metrically regular square of metrically regular bigraphs. {II.}},
     journal = {Archivum mathematicum},
     pages = {17--24},
     publisher = {mathdoc},
     volume = {28},
     number = {1-2},
     year = {1992},
     mrnumber = {1201862},
     zbl = {0778.05058},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1992__28_1-2_a3/}
}
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Vetchý, Vladimír. Metrically regular square of metrically regular bigraphs. II.. Archivum mathematicum, Tome 28 (1992) no. 1-2, pp. 17-24. http://geodesic.mathdoc.fr/item/ARM_1992__28_1-2_a3/