Reference
Inline Math $ ... $ or \( ... \)
Display Math $$ ... $$ or \[ ... \]
Internal Links {uid} - e.g. {S000001} for space 1
{S000001|P000002} for space 1's value of property 2
External Links {{<provider>:<id>}} - e.g. {{doi:123}}.

Provider should be one of: doi, mr, wikipedia, mathse, or mo, or zb