The phrase "a source of substantial" is correct and usable in written English.
It can be used when discussing something that provides a significant amount of a particular quality or resource.
Example: "The research identified a source of substantial funding for the new project."
Alternatives: "a significant source of" or "a major source of".
The Bush Administration's war on terror has became a source of substantial profit for Halliburton.
And last year, the team opened a new stadium that is a source of substantial new revenue.
What Grant doesn't say – he doesn't have to – is that most African farmers are too poor to be a source of substantial profits to big global biotech firms.
Four control room crews failed to pass their annual requalification tests in the last three months, a source of "substantial" safety concerns, the commission said.
Financial considerations have moved to the forefront in late-night television, because the network shows, once a source of substantial profits, have fallen off in recent years.
He acknowledged that the Asian business had slowed — Sotheby's Hong Kong sales were down about $131 million from the previous year — but added that the auction house's business in Asia remained "very profitable and a source of substantial opportunity with new wealthy collectors".
We believe that requiring accurate knowledge of the PSF as a prerequisite is problematic and a potential source of substantial error of the partial volume correction, especially in a clinical context, where data sets might undergo individually different postprocessing/smoothing.
We did not compare the findings of Xpert with a composite reference standard since it was evident that this was a further source of substantial heterogeneity since composite reference standards varied so much between studies.
Although cash buyers of Citizens are unlikely in the near term, it does highlight a potential source of substantial value within the group.
Simultaneous multiple spacecraft observations thus suggest a likely source of substantial particle energization exists in the cusp region.
Agriculture as a source of food has a substantial spillover that affects the Earth's ecosystems.
