select lines of zero length (for deletion)

Hi

I need to select a load of zero length lines that have been generated when I exported a 3D file to a 2D.  They won't respond to selection as type "point" and the element property is line with a length of 0.  Anyone any idea of how to do this?  Naturally they have exactly the same colour/style/weight as all the other visible lines on the drawing that I want to keep!

many thanks and Happy New Year!

Alan