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automatic^[1]

cite web ^[2]

cite book ^[3]

cite news ^[4]

cite journal ^[5]

basic^[6]

^ "BBC - Home". bbc.co.uk. Retrieved 2021-01-12.
^ http://techcrunch.com. Missing or empty |title= (help)
^ angesl and demons.
^ Empty citation (help)
^ trish. Cite journal requires |journal= (help); Missing or empty |title= (help)
^ basic form

${\ddot {a}}$ ${\ce {Hg^{2}+->[I-]HgI2->[I-]{[Hg^{II}I4]^{2}-}}}$

re-use^[1]

int a = c;

^ ^a ^b Cite error: Invalid <ref> tag; no text was provided for refs named :0; see Help:Cite errors/Cite error references no text ().

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