Gerhardstein, J.P. "Multi-Tone Audio Analysis", NI Week 2007, Austin, TX, (August 5, 2007).

Lafond, E.F., Brodeur, P.H., Gerhardstein, J.P., Habeger, C.C., Telschow, K.L., "Photorefractive Interferometers for Ultrasonic Measurements on Paper", Ultrasonics 40(10), 1019-1023 (Dec. 2002).

Habeger, Jr., C. C., LaFond, E. F., Brodeur, P. and Gerhardstein, J. P., "System and Method of Reducing Motion-induced Noise in the Optical Detection of an Ultrasound Signal in a Moving Body of Material", U.S. Patent No. 6,356,846 (March 12, 2002) [Assignee: IPST].

Brodeur, P.H., Deng, Y., Gerhardstein, J.P., Yan, Z., Bose, F., Jong, J.H., and Choi, M.H., "Whitewater Clarification Using a Dual Flocculation/Ultrasonic Method", J. Pulp & Paper Sci. 27(4): 130-138 (2001).

Jong, J.H., Brodeur, P.H., Lafond, E.F., Gerhardstein, J.P. and Pufhal, B.M., "Laser Ultrasonics for Noncontact Measurement of Lamb Waves in Static and Moving Paper", J. Pulp & Paper Sci., 26(10): 358-366 (2000).

Jong, J.H., Choi, M.H., Gerhardstein, J.P., and Brodeur, P.H., "Acoustic Separation of Moving Fibers in a Pulp Flow", Proc. 1999 TAPPI Pulping Conf., Orlando, FL., Vol. 2, 759-769 (1999).

Gerhardstein, J.P., Brodeur P.H., Walsh, L.D., Waterhouse, J.F., "The Relationship Between ZD Ultrasonics Stiffness and Beta Formation", IPST Technical Paper Series (792) (1999).

Brodeur, P.H., Gerhardstein, J.P., Lafond, E.F., Jong, J.H., Habeger, C.C., Pufahl, B.M., Deason, V.A., Telschow, K.L. and Berthelot, Y.H., "Monitoring the Mechanical Behavior of Paper During Papermaking", TAPPI International Paper Physics Conference, San Diego, CA, 437-445 (Sept. 1999).

Gerhardstein, J., Lafond, E., Jong, J., Pufahl, B., Brodeur, P., "Noncontact Laser Ultrasonics Measurement of Texture Noise Using A Moving Web Simulator", 1999 TAPPI Engineering Conference Proceedings (1999).

Lafond, E., Gerhardstein, J., Brodeur, P., "Non-contact Characterization of Static Paper Materials Using a Photorefractive Interferometer", SPIE Conference on Nondestructive Evaluation Techniques for Aging Infrastructure & Manufacturing / Process Control and Sensors for Manufacturing, Newport, CA, SPIE 3589 (March 1999).

Jong, J.H., Lafond, E.F., Brodeur, P.H., Gerhardstein, J.P. and Pufahl. B.M., "Dispersion of Lamb Waves Propagating in Static and Moving Paper To Measure Stiffness Using Non-Contact Laser Ultrasonics", Proceedings of 85th Pulp and Paper Technical Association of Canada Annual Conference, Montreal, A145-A148 (Jan. 25- 29, 1999).

Jong, J.H., Brodeur, P.H. and Gerhardstein, J.P., "Measurement and Analysis of Stiffness Properties in Moving Paper using NonContact Laser Ultrasonics", TAPPI International Paper Physics Conference, San Diego, CA, 19-27 (Sept. 1999).

Brodeur, P.H. and Gerhardstein, J.P., "Overview of Applications of Ultrasonics in the Pulp and Paper Industry", Proc. of IEEE International Ultrasonics Symposium, Sendai, Japan, 809-815 (Oct. 1998).

Brodeur, P.H. et al., "Contactless Real-Time Monitoring of Paper Mechanical Behavior during Papermaking", Report submitted to U.S. Department of Energy (No.DE-FC07-97ID13578) (Oct. 1998).

Brodeur, P.H., Berthelot, Y.H., Gerhardstein, J.P. and Johnson, M.A., "Material Characteristics Testing Method and Apparatus Using Interferometry to Detect Ultrasonic Signals in a Web", U.S. Patent No. 5,814,730 (Sept. 29, 1998) [Assignee: IPST].

Brodeur, P.H., Johnson, M.A., Berthelot, Y.H. and Gerhardstein, J.P., "Noncontact Laser Generation and Detection of Lamb Waves in Paper", J. Pulp & Paper Sci., 23(5): J238-J243 (1997).

J. L. Streator, J. P. Gerhardstein, and C. B. McCollum, "The Low-Pressure Rheology of Ultra-Thin Lubricant Films and Its Influence on Sliding Contact", Journal of Tribology 115(1), 119-126 (1994).