Oronzo Altamura Floriana Esposito Donato Malerba Transforming paper documents into XML format with WISDOM++. 2-17 2001 4 IJDAR 1 http://link.springer.de/link/service/journals/10032/bibs/1004001/10040002.htm db/journals/ijdar/ijdar4.html#AltamuraEM01