@article{CombotKoutschan12,
 author = {Thierry Combot and Christoph Koutschan},
 title = {Third order integrability conditions for homogeneous potentials of degree~$-1$},
 journal = {Journal of Mathematical Physics},
 year = {2012},
 volume = {53},
 number = {8},
 pages = {082704},
 isbn_issn = {ISSN 0022-2488},
 doi = {10.1063/1.4746691},
}