The phrase "a combination of extensive" is correct and usable in written English.
It can be used when describing something that is made up of various extensive elements or components.
Example: "The project was successful due to a combination of extensive research, collaboration, and innovative ideas."
Alternatives: "a blend of comprehensive" or "a mixture of thorough".
The precise causes of this process are not well known, but it may result from a combination of extensive deformation accompanied by recrystallization.
Their structures were identified by a combination of extensive spectroscopic analyses (NMR, MS, IR, UV, and D) and chemical methods.
This may be by a combination of extensive marketing but certainly because RAS answers the needs of some robotic surgeons not familiar with conventional laparoscopic surgery.
Though the extent of proteome coverage lags that of the well-studied mouse heart (4906 proteins) [33], through a combination of extensive dissection (100 Drosophila hearts can be harvested in a day) and careful data validation, we have compiled 1228 protein clusters from an organ whose mass is about 1/106 that of mouse heart.
A combination of extensive vascular involvement in one lobe and bile duct involvement to the second order branches in the other lobe.
The remaining ~55% of wheat genes are expressed from either one or two homoeoloci only, through a combination of extensive transcriptional silencing and homoeolocus loss.
Uganda, for example, has cut infection rates in half in recent years, through a combination of education, extensive testing and counseling, and condom promotion.
The information in this report was derived from a combination of sources: extensive literature and Internet research and a comprehensive interview program.
They hypothesized this was due to a combination of more extensive disease at diagnosis, delay in diagnosis, co-morbidity such as infection, differences in achievable home hygiene and poor access to acute and supportive care.
We conclude that the pinning of ordinary dislocations and anomalous mechanical behaviour in γ-TiAl must be attributed to a combination of extrinsic obstacles and extensive cross-slip in a crystal containing impurities.
It was a combination of individual studies with extensive hands-on experience resulting in experiential learning.
