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- spin-resolved x-ray photoelectron spectroscopy
- spin resonance
- spin resonance transistor
- (spin-)restricted quadratic configuration interaction with single and double excitations and triple excitations added perturbatively
- united nations economic commission for latin america and the caribbean
- united nations economic development administration
- united nations edifact (electronic data interchange for finance, administration, commerce, and transport) guidelines for trade data interchange
- united nations educational, scientific and cultural organisation
- united nations educational scientific and cultural organization
- united nations educational, scientific and cultural organization
- united nations educational, scientific, and cultural organization
- united nations educational, social and cultural organization
- united nations education, scientific and cultural organization
- united nations electoral assistance division
- united nations/electronic data interchange for administration, commerce and transport
- united nations electronic interchange for administration commerce and transport
- united nations emergency unit for ethiopia
- united nations environmental program
- united nations environment organisation
- united nations environment organization
- united nations environment program
- united nations environment programme
- united nations environment programme division of technology, industry and economics
- united nations environment programme finance initiative
- united nations environment programme world conservation monitoring centre
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