Assertion: baryon's existence | /r/HasProperty | speculated by a number of authors
Facets:
value: around 1964
type: TEMPORAL
Source sentences:
text: The existence of a fourth quark had been speculated by a number of authors around 1964 (for instance by James Bjorken and Sheldon Glashow), but its prediction is usually credited to Sheldon Glashow, John Iliopoulos and Luciano Maiani in 1970 (see GIM mechanism).