The phrase "a complementary source" is correct and usable in written English.
It can be used when referring to a source of information or support that enhances or completes another source.
Example: "In our research, we found that using a complementary source helped to validate our findings and provided additional insights."
Alternatives: "an additional source" or "a supplementary source".
With many of the MAPs gathered from the wild, collection and sale is providing a complementary source of cash for many extremely poor rural households.
These results show the role of camel milk as a complementary source of food and income for pastoral households.
SIRENE starts from this suggestion and considers VGI as a complementary source of information in the SDI framework.
It could be used as a complementary source of information in the detection of mineral deposition, such as iron and copper [24].
Latest advances have allowed the technique to be refined, thereby expanding its clinical applicability to brain imaging as a complementary source of information to conventional T1-weighted and T2-weighted imaging sequences.
To avoid the risk of water shortages, the use of groundwater as a complementary source has become more common among the farmers of the area (Suthidhummajit and Kootanakulvong 2011).
The government of Bangladesh and other low- and middle income countries can consider health insurance using occupational solidarity as a potential complementary source of funding along with indirect taxes for financing healthcare of informal sector workers.
Especially, protein protein interaction data provide a meaningful complementary source and can be applied to identify relevant biological effects at the network level [ 53, 98].
While such 'no-call' or false-negative errors in parents can be ameliorated somewhat with higher sequencing depth and/or more comprehensive variant-calling strategies, larger and more comprehensive pedigrees provide a powerful, complementary source for discovering and studying human genetic variation.
Amaranth seeds are considered as an excellent complementary source of food protein due to their balanced amino acid composition.
The Baldini score represents an essential complementary source of information to the existing KSS and KOOS scores since both scores do not specifically focus on patellofemoral problems.
