Luca Bernardinello Elena Monticelli Lucia Pomello On Preserving Structural and Behavioural Properties by Composing Net Systems on Interfaces. 31-47 2007 80 Fundam. Inform. 1-3 http://iospress.metapress.com/content/g55765l5l5284uu2/ db/journals/fuin/fuin80.html#BernardinelloMP07