C# 这些程序集引用从何而来？

问：

我有一个在引用下列出实体框架和几个SQLite程序集的地方。我想删除它们，但它们不断回来。项目中没有。并且这个项目不引用SQLite。文件的引用部分不引用它们：.csprojnuget.config.csproj

<ItemGroup>
    <Reference Include="PdfSharp-gdi, Version=1.50.5147.0, Culture=neutral, PublicKeyToken=f94615aa0424f9eb, processorArchitecture=MSIL">
      <HintPath>..\Packages\PDFsharp-gdi.1.50.5147\lib\net20\PdfSharp-gdi.dll</HintPath>
    </Reference>
    <Reference Include="PdfSharp.Charting-gdi, Version=1.50.5147.0, Culture=neutral, PublicKeyToken=f94615aa0424f9eb, processorArchitecture=MSIL">
      <HintPath>..\Packages\PDFsharp-gdi.1.50.5147\lib\net20\PdfSharp.Charting-gdi.dll</HintPath>
    </Reference>
    <Reference Include="LocalLib">
      <HintPath>..\..\localpath\bin\LocalLib.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.Core" />
    <Reference Include="System.Drawing" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Data" />
    <Reference Include="System.Net.Http" />
    <Reference Include="System.Xml" />
</ItemGroup>

但在 VS2019 中，Entity Framework 与 SQLite 程序集一起列在参考中。它在哪里找到参考资料，我该如何摆脱它们？