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The part of a sentence "was used as reference" is correct and usable in written English.
You can use it to show that someone or something was referenced by another person or thing. For example: "The book was used as reference by the professor in her lecture."
Exact(60)
Average was used as reference.
A SCE was used as reference electrode.
Nipponbare Wx sequence was used as reference.
Deionized water was used as reference.
Ethanol was used as reference solvent.
Classical digestion was used as reference method.
Nafion® 112 was used as reference material.
Acetobacterium woodii was used as reference strain.
Pure TiO2 was used as reference.
A flat die without pocket was used as reference.
Marketed drug efavirenz was used as reference during the study.
More suggestions(15)
examples to be used as references
was used as guidance
was used as benchmark
was used as material
was used as referral
was utilized as reference
was used as benchmarks
was used as food
was used as currency
was used as case
was taken as reference
was used as feed
was used as standard
was used as reflected
currently used as reference
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com