Regular Expressions with Numerical Occurrence Indicators - preliminary results. - Pekka Kilpeläinen; Rauno Tuhkanen (SPLST, 2003)

Towards efficient implementation of XML schema content models. - Pekka Kilpeläinen; Rauno Tuhkanen (ACM Symposium on Document Engineering, 2004)

One-unambiguity of regular expressions with numeric occurrence indicators. - Pekka Kilpeläinen; Rauno Tuhkanen (Inf. Comput., 2007)