SPARQL and untyped resources

Hi all,

I'm trying to build a SPARQL query that selects all the resources that are
ONLY rdfs:Resources (untyped let's say).
What I need is to identify those resources that do not have an explicit
rdf:type, thus are of rdf:type rdfs:Resource.
In the past I did it in Serql using the MINUS construct...but when it comes
to sparql I don't know how to solve it...

Could anyone help me out please?

best,

Christian