@article{10_37236_2709,
     author = {M. R. Faghihi and E. Ghorbani and G. B. Khosrovshahi and S. Tat},
     title = {On optimality of designs with three distinct eigenvalues},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {2},
     doi = {10.37236/2709},
     zbl = {1266.05081},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2709/}
}