<PropertyGroup>
    <TargetList>@(Targets->'%(filename)%(extension)', '; ')</TargetList>
  </PropertyGroup>
  <Target Name="BeforeBuild">
     <MSBuild
    Projects="@(ProjectReference)"
    Targets="GetTargetPath">
    <Output TaskParameter="TargetOutputs" ItemName="Targets" />
    </MSBuild>
    <Message Text="My reference list is $(TargetList)" />
  </Target>