<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>13</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gheorghe Paun</style></author><author><style face="normal" font="default" size="100%">Mario J. Pérez-Jiménez</style></author><author><style face="normal" font="default" size="100%">Fernando Sancho-Caparrini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">On the Reachability Problem for P Systems With Symport/Antiport</style></title><secondary-title><style face="normal" font="default" size="100%">Publicationes Mathematicae Debrecen</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><pub-location><style face="normal" font="default" size="100%">Debrecen, Hungría</style></pub-location><volume><style face="normal" font="default" size="100%">65</style></volume><pages><style face="normal" font="default" size="100%">603-627</style></pages></record></records></xml>