5
Energa̕ y desarrollo sostenible
6
Energa̕ renovable y desarrollo sostenible
7
Annual energy outlook 2012 , with projections to 2035
8
Diccionario de třminos de PEMEX refinacin̤
12
15
Dairy processing energy best practice guidebook
16
Nuclear power (Fission)
18
Economic feasibility applied to wind energy projects
19
2010 survey of energy resources
20
Petrl̤eo , prospeccin̤ y perforacin̤