Mo. Rev. Stat. § 452.311
Current with changes from the 2023 Legislative Session
A petition is not filed within the meaning of supreme court rule 53.01 in any cause of action authorized by the provisions of this chapter, unless a summons is issued forthwith as required by supreme court rule 54.01, a verified and notarized entry of appearance of respondent is filed or an attorney files an entry of appearance on behalf of respondent.
§ 452.311, RSMo