Marek A. Bednarczyk Luca Bernardinello Benoît Caillaud Wieslaw Pawlowski Lucia Pomello Modular System Development with Pullbacks. 140-160 2003 conf/apn/2003 ICATPN http://link.springer.de/link/service/series/0558/bibs/2679/26790140.htm db/conf/apn/icatpn2003.html#BednarczykBCPP03