[Feature]: Hopfenberg Model

[sepandhaghighi]

Describe the feature you want to add

Hopfenberg Model

References:

1. Controlled Release from Erodible Slabs, Cylinders, and Spheres. H. Hopfenberg, Published 1
   June 1976. Materials Science, Engineering. DOI:10.1021/bk-1976-0033.ch003

2. Chavda HV, Patel MS, Patel CN. Preparation and in vitro evaluation of guar gum based triplelayer matrix tablet of diclofenac sodium. Res Pharm Sci. 2012 Jan;7(1):57-64. PMID: 23181081;
   PMCID: PMC3500559

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Additional context

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