However, Pimentel andPatzek (2007)

However, Pimentel and
Patzek (2007) report a negative 50% return in ethanol produced compared with
fossil energy inputs in switchgrass conversion

ผลลัพธ์ (อังกฤษ) 2:

However, Pimentel and
Patzek (2,007th) Report a negative 50% Return in ethanol produced compared with
Fossil Energy inputs in switchgrass conversion.