@article{MM3_2000_4_1_a7,
     author = {Mirko Lepovi\'c},
     title = {On {Eigenvalues} and {Main} {Eigenvalues} of a {Graph}},
     journal = {Mathematica Moravica},
     pages = {51 - 58},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2000},
     url = {https://geodesic-test.mathdoc.fr/item/MM3_2000_4_1_a7/}
}