@article{10_37236_1594,
     author = {Chunhui Lai},
     title = {A lower bound for the number of edges in a graph containing no two cycles of the same length},
     journal = {The electronic journal of combinatorics},
     year = {2001},
     volume = {8},
     number = {1},
     doi = {10.37236/1594},
     zbl = {0981.05062},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1594/}
}