References

[1]Alexander, Christopher: Notes on the Synthesis of Form,
Harvard University Press.1964
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[2]Alexander, Christopher: A Pattern Language
Oxford University Press, USA 1977
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[3]Alexander, Christopher: The Timeless Way of Building
Oxford University Press, USA. 1979
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[4]Gamma, Erich., Helm, Richard., Johnson, Ralph. and Vlissides, John: Design Patterns: Elements
   of Reusable Object-Oriented Software.
   Addison-Wesley Professional. 1st edition 1995.
   Amazon