Robert Klemme:
> class Foo
>    def self.a_class_method
>      # ...
>    end
> 
>    def an_instance_method
>      self.class.a_class_method
>      self.another_class_method
       ^^^^^^^^^^^^^^^^^^^^^^^^^
>    end
> end
> 
> def Foo.another_class_method
>    # ...
> end

It seems that you did not write what you meant in the marked line.

Kalman