Cassel, D. K., Brown, J. M., & Johnson, G. A. (1990). Computer tomographic analysis of water distribution and flow in porous media. Theoretical and Applied Climatology, 42(4), 223–228. https://doi.org/10.1007/BF00865982

Johnson, G. A., Chotas, H. G., Suddarth, S. A., Ziv, S. B., & Todd, B. E. (1990). Integrated network for medical imaging research. Proceedings of Spie the International Society for Optical Engineering, 1234 pt 1, 159–166. https://scholars.duke.edu/display/pub778669

Stern, R. L., Johnson, G. A., & Ravin, C. E. (1990). Magnetic resonance imaging of the thoracic cavity using a paused 3DFT acquisition technique. Magn Reson Imaging, 8(6), 747–753. https://doi.org/10.1016/0730-725x(90)90010-y

Farmer, T. H., Cofer, G. P., & Johnson, G. A. (1990). Maximizing contrast to noise with inductively coupled implanted coils. Invest Radiol, 25(5), 552–558. https://doi.org/10.1097/00004424-199005000-00013

MacFall, J. R., Benveniste, H., Maki, J., Johnson, G. A., Hedlund, L., & Copher, G. (1990). MR diffusion measurements in stroke models in rat brains. Proceedings of the Annual Conference on Engineering in Medicine and Biology, (pt 1), 67–68. https://ieeexplore.ieee.org/document/690951

MacFall, J. S., Johnson, G. A., & Kramer, P. J. (1990). Observation of a water-depletion region surrounding loblolly pine roots by magnetic resonance imaging. Proc Natl Acad Sci U S A, 87(3), 1203–1207. https://doi.org/10.1073/pnas.87.3.1203

Baxter G.W., Behringer R.P., Fagert T., Johnson G.A. (1990) Pattern Formation and Time-Dependence in Flowing Sand. In: Joseph D.D., Schaeffer D.G. (eds) Two Phase Flows and Waves. The IMA Volumes in Mathematics and Its Applications, vol 26. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9022-0_1

Brown, J. M., Kramer, P. J., Cofer, G. P., & Johnson, G. A. (1990). Use of nuclear magnetic resonance microscopy for noninvasive observations of root-soil water relations. Theoretical and Applied Climatology, 42(4), 229–236. https://doi.org/10.1007/BF00865983