A riough translation of the mentioned article:
"The helicopter manufacturer Kaman in Bloomfield was tasked by the BuAer with
the development of a VTOL aircraft for research purposes. The contractor describes
this project as a "ring wing" aircraft, that externally looks like a barrel, its fuselage
inside that "barrel". Lift is produced by the air streaming over the inner and outer sides
of the ring wing. Kaman suggested, that for propulsion either piston or jet engines
could be used. Consultant for this project is Dr. Manfred Rauscher from Zurich, founder
of the Aeroelastic Laboratory at the Massachusetts Institute of Technology.
In the laboraties of the Collins Radio Co. in Cedar Rapids (Iowa), where Alexander
Lippisch is working, a similar vehicle is said to be under development. "
Not too much new information, I'm afraid, maybe the name Dr.Rauscher can
be keyword for new search ?