List of parent nodes with a sublist of child referring nodes on a single content type
Recapitulation


Relationships->Add->Entity Reference: Referencing entity of the Field that reference to himself. Also check Require this relationship.
Fields->Add->Content: Title.
Fields->Add->Content: Title and use the relationship.
Format->HTML list (makes a wrapper element).
Format->Settings->Grouping field Nr.1->Content: Title.
Fields->Edit Content: Title->Exclude from display (it will be displayed by the grouping).




PS Also check the Views Field View module mentioned by @tenken here