Lee, A.P.; Hamilton, J. & Trevino, J. A low power, tight seal, polyimide electrostatic microvalve, article, April 17, 1996; (https://digital.library.unt.edu/ark:/67531/metadc686540/m1/2/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .