Reference:
Harri Haanpää. A lower bound for a Ramsey number. Congressus Numerantium, 144:189–191, 2000.
Suggested BibTeX entry:
@article{haa00:lowbou, author = {Harri Haanp{\"a}{\"a}}, journal = {Congressus Numerantium}, pages = {189--191}, title = {A Lower Bound for a {R}amsey Number}, volume = {144}, year = {2000}, }