@article {719, title = {On a partial affirmative answer for a Paun{\textquoteright}s conjecture}, journal = {International Journal of Foundations of Computer Science}, volume = {22}, year = {2011}, pages = {55-64}, publisher = {World Scientific}, address = {London, U.K.}, issn = {0129-0541}, author = {Ignacio P{\'e}rez-Hurtado and Mario J. P{\'e}rez-Jim{\'e}nez and Agust{\'\i}n Riscos-N{\'u}{\~n}ez and Miguel A. Guti{\'e}rrez-Naranjo and Miquel Rius-Font} }