Reference beam

https://www.wikidata.org/wiki/Q7307113

Field Hierarchy

Parent
Physics 33.6M papers	Engineering 25.6M papers	Quantum mechanics 13.6M papers	Optics 8.2M papers
Astronomy 2.8M papers	Structural engineering 2.6M papers	Civil engineering 868k papers	Beam (structure) 471k papers
Interferometry 149k papers		Holography 75.7k papers
Current
Reference beam 1,949 papers
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History