PDMY and PDMY02 model

[mirkomorosi]

Dear all,
I'm implementing site response analysis using PDMY and PDMY02 soil model.
I'm using Opensees 2.4.4 Rev.5764.
I would like to know which are the references of the last released soil material models and which are the equations implemented in the soil constitutive model defining plastic contraction and dilation flow rule (either PDMY or PDMY02 material). Knowing this references I would be able to properly understand the meaning of associated coefficient (c1, c2, c3, d1, ...).

Furthermore, regarding the critical state line definition implied in the soil model (defined through the coefficient cs1, cs2 and cs3), I would like to know whether the feature of disabling dilation and contraction setting volumetric strains to zero, as soon as the updated void ratios matches the critical state line, is currently available and implemented in the 2.4.4 Opensees release.

Regards
Mirko