icoUncoupledKinematicParcelFoam description

Hello, I hope this is not an inconvenient time, I am using icoUncoupledKinematicParcelFoam and I just wondered if you knew of any mathematical description of the approach (esp parcel definition, governing equations, integration)? I am only interested for academic purposes. I've been told to tag @Sergio. Cheers! Kind regards, Andy