Perhaps you should try some spelling variations:
2.7 communication » 2.3 communication, 3.2 communication, 2 communication
technology ties » technology tieups, technology studies, technology thesis
ties population » u.s population, les populations, nations population
population per » population panel, population p230, population area
4 developing » 3 developing
developing 1 » developing _, developing a, developing e
1 fabrique » la fabrique
per fig » per firm
fig 2.7 » figs 2.7, fig 2.1, fig 2.2
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology ties population per fig 2.7 communication costs 4 developing 1 fabrique.*.