@Article{AMZKPZ:TCJ:2016,
	author = {A. Meduna and Z. K\v{r}ivka and P. Zemek},
	title = {Phrase-Structure Grammars: Normal Forms and Reduction},
	pages = {1180--1185},
	journal = {The Computer Journal},
	volume = {59},
	number = {8},
	year = {2016}
}