@conference {Zouhar:2007,
	title = {A Problem of Substitution in Extensional Contexts and Direct Reference},
	booktitle = {Meze formalizace, analyti{\v c}nosti a prostoro{\v c}asu},
	year = {2007},
	pages = {259-268},
	publisher = {Filosofia Praha},
	organization = {Filosofia Praha},
	author = {Zouhar, Mari{\'a}n},
	editor = {Havl{\'\i}k, Vladim{\'\i}r}
}
