@ARTICLE{DasMVi_j2000, AUTHOR = {J{\"u}rgen~Dassow and Carlos~Mart\'{\i}n-Vide and Gheorghe~P\u{a}un and Alfonso~Rodr\'iguez-Paton}, TITLE = {Conditional Concatenation}, JOURNAL = fundinform, YEAR = 2000, VOLUME = 44, NUMBER = 4, PAGES = {353--372}, url = {http://iospress.metapress.com/content/c4bpmhxrywlt843v/fulltext.pdf} } %http://fi.mimuw.edu.pl/abs44.html#14