by Sorin Istrail
Reference:
Sorin Istrail, "A fixed-point approach to contextual languages", In Revue Roumaine de Mathematiques Pures et Appliquees, vol. 25, no. 6, pp. 861-869, 1980.
Bibtex Entry:
@ARTICLE{Istrail1980,
author = {Istrail, Sorin},
title = {A fixed-point approach to contextual languages},
journal = {Revue Roumaine de Mathematiques Pures et Appliquees},
year = {1980},
volume = {25},
pages = {861--869},
number = {6},
owner = {Derek},
timestamp = {2012.05.08},
category = {Theory of Computation}
}