Perhaps you should try some spelling variations:
references conclusion » references correction
de communication » mobile communication, online communication
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
conclusion 2.6 » conclusion 2.4, conclusion 2.5, conclusion 2.7
2.6 die » 3.6 die, 4.6 die
media a » media _, media 1, media 3
die de » die die, die der, die den

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: methods references conclusion 2.6 die de communication media a developpement en afrique.*.