Perhaps you should try some spelling variations:
2.15 communication » 2.14 communication, 2.5 communication, 2.3 communication
population panel » population age, population based, population area
developpement du » developpement de, developpement des, developpement et
technology ties » technology tieups, technology studies, technology thesis
ties population » u.s population, les populations, nations population
du afrique » en afrique, l afrique, de l'afrique
panel fig » panel firm, panel i, panel ii
fig 2.15 » fig 2.1, fig 2.35, fig 12.11

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

• Adding a wildcard symbol may retrieve word variants: technology ties population panel fig 2.15 communication costs _ developpement du afrique.*.