MediaWiki:Apihelp-mobileview-param-sections/en

Pipe-separated list of section numbers for which to return text. "all" can be used to return for all. Ranges in format "1-4" mean get sections 1,2,3,4. Ranges without second number, e.g. "1-" means get all until the end. "references" can be used to specify that all sections containing references should be returned.