Media type: E-Article Title: E-Commerce and Web Technologies: Educational Resources as Digital Products Contributor: Landowska, Agnieszka; Kaczmarek, Jerzy Published: Springer Berlin Heidelberg, 2005 Published in: E-Commerce and Web Technologies (2005), Seite 228-237 Language: Not determined DOI: 10.1007/11545163_23 ISSN: 0302-9743; 1611-3349 Origination: Footnote: