1.

Conference Proceedings
Conference Proceedings
1. Design of a piezoelectric inchworm actuator and compliant end effector for minimally invasive surgery
Canfield, S. ; Edinger, B. ; Frecker, M. I. ; Koopmann, G. H.
Pub. info.: Smart structures and materials 1999 : smart structures and integrated systems : 1-4 March, 1999 Newport Beach, California.  pp.835-843,  1999.  Bellingham, Wash..  SPIE - The International Society of Optical Engineering
Title of ser.: Proceedings of SPIE - the International Society for Optical Engineering
Ser. no.: 3668
2.

Conference Proceedings
Conference Proceedings
2. Design and performance of a high-force piezoelectric inchworm motor
Frank, J. E. ; Koopmann, G. H. ; Chen, W. ; Lesieutre, G. A.
Pub. info.: Smart structures and materials 1999 : smart structures and integrated systems : 1-4 March, 1999 Newport Beach, California.  pp.717-723,  1999.  Bellingham, Wash..  SPIE - The International Society of Optical Engineering
Title of ser.: Proceedings of SPIE - the International Society for Optical Engineering
Ser. no.: 3668
3.

Technical Paper
Technical Paper
3. IMPROVING THE ACCURACY OF THE BOUNDARY INTEGRAL METHOD BASED ON THE HELMHOLTZ INTEGRAL
Koopmann, G. H. ; Brod, K.
Pub. info.: NASA Technical Reports.  (NASA-CP-2404),  pp.1-2,  1985.  National Aeronautics and Space Administration