Soil Deformation | Estimating Poisson's ratio and Soil Modulus from Triaxial Tests

Poisson's ratio and soil modulus (Young's modulus) define the capacity of soil to deform under stresses. These properties are important for design purposes and can be estimated from a triaxial test. This video gives an example of how to do so.
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[@thiagoazevedo5456]

Where can I find the reference for this formula?

[@YadhuNandanME]

Thank you