@InProceedings{AMLVPZ:DCFS:2012,
	author = {A. Meduna and L. Vr\'{a}bel and P. Zemek},
	title = {An Infinite Hierarchy of Language Families Resulting from Stateless Pushdown Automata with Limited Pushdown Alphabets},
	pages = {236--243},
	booktitle = {DCFS'12: 14th International Workshop on Descriptional Complexity of Formal Systems},
	series = {LNCS 7386},
	journal = {Lecture Notes in Computer Science},
	volume = {2012},
	number = {7386},
	year = {2012},
	address = {Braga, PT},
	publisher = {Springer}
}