How do I find out that some types were embedded into the assembly by looking at the assembly in decompiler or using reflection api?

[eterekhin]

I read this article and want to find out that assembly has embedded types by looking at the assembly in a decompiler, for example, or using .net reflection API. Could someone prompt how to find out? The only solution I see is to iterating over types in the assembly and checking each one if it has TypeIdentifierAttribute, but it is inefficient and probably wrong in some cases.