Genre
Electronic journals
43
Periodicals
41
Libros electrónicos
33
Electronic books
30
Internet resources
19
Périodiques
8
Congresses
2
Libros electronicos
2
Libros electr{acute}onicos
2
Tables
2
Amateurs' manuals
1
Case studies
1
Formulae
1
Handbooks, manuals, etc
1
Problemas y ejercicios
1
Problems, exercises, etc
1