Carsten Ullrich..Pedagogically founded courseware generation for web-based learning : an HTN-planning-based approach implemented in PAIGOS /.Springer,,2008..
C. L.]]W. J. Freeby]]Ullrich,P/M in Defense Technology Seminar.P/M in Defense Technology Seminar (1984 : Picatinny Arsenal):Powder metallurgy in defense technology.V.6.MPIF,1985.