@article {Zouhar:2009,
	title = {On the Notion of Rigidity for General Terms},
	journal = {Grazer philosophische Studien. Internationale Zeitschrift f{\"u}r analytische Philosophie},
	volume = {78},
	year = {2009},
	pages = {207-229},
	author = {Zouhar, Mari{\'a}n}
}
