@article{10_1017_S0017089500004171,
     author = {Harborth, Heiko and Nitzschke, Heinz-Michael},
     title = {Solution of {Irving's} {Ramsey} problem},
     journal = {Glasgow mathematical journal},
     pages = {187--197},
     year = {1980},
     volume = {21},
     number = {1},
     doi = {10.1017/S0017089500004171},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500004171/}
}