Equivalent Parallel and Perpendicular Unsaturated Hydraulic Conductivities: Arithmetic Mean or Harmonic Mean?

Zhu, J. (2008). Equivalent Parallel and Perpendicular Unsaturated Hydraulic Conductivities: Arithmetic Mean or Harmonic Mean?, Soil Science Society of America Journal, 72, 1226-1233, 10.2136/sssaj2007.0337