S.R. Gehrke, & K.J. Clifton. (2016). Toward a spatial-temporal measure of land-use mix. The Journal of Transport and Land Use 9(1): 171-186. 
Transportation & Land Use
Research on the spatial interactions between transportation and land use systems and activity.
Journals
S.R. Gehrke, & K.J. Clifton. (2014). Operationalizing land use diversity at varying geographic scales and its connection to mode choice: Evidence from Portland, Oregon. Transportation Research Record: Journal of the Transportation Research Board 2453: 128-136.
K.J. Clifton, & S.R. Gehrke. (2013) Application of geographic perturbation methods to residential locations in the Oregon Household Activity Survey: Proof of concept. Transportation Research Record: Journal of the Transportation Research Board 2354: 40-50.
Exploring engagement in household activities and decisions on residential tenure and household type.
R.B. Chen, S.R. Gehrke, J.H. Liu, Y. Jang, & K.J. Clifton. (2013). Exploring engagement in household activities and decisions on residential tenure and household type. Transportation Research Record: Journal of the Transportation Research Board 2344: 68-78.