Added citation information.

CITATION

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+To cite su4sml, please use
+
+  Achim D. Brucker, Jürgen Doser, and Burkhart Wolff. An MDA Framework Supporting 
+  OCL. In Electronic Communications of the EASST, 5, 2006.
+  (doi:10.14279/tuj.eceasst.5.45)[http://dx.doi.org/10.14279/tuj.eceasst.5.45)
+
+A BibTeX entry for LaTeX user is
+
+@Article{	  brucker.ea:mda:2006-b,
+  abstract	= {We present an MDA framework, developed in the functional
+		  programming language SML, that tries to bridge the gap
+		  between formal software development and the needs of
+		  industrial software development, e.g., code generation.
+		  Overall, our tool-chain provides support for software
+		  modeling using UML/OCL and guides the user from
+		  type-checking and model transformations to code generation
+		  and formal analysis of the UML/OCL model. We conclude with
+		  a report on our experiences in using a functional language
+		  for implementing MDA tools.},
+  author	= {Achim D. Brucker and J\"urgen Doser and Burkhart Wolff},
+  doi		= {10.14279/tuj.eceasst.5.45},
+  editor	= {Birgith Demuth and Dan Chiorean and Martin Gogolla and Jos
+		  Warmer},
+  issn		= {1863-2122},
+  journal	= {Electronic Communications of the EASST},
+  keywords	= {MDE , MDA , OCL, model transformation, code-generation,
+		  verification},
+  language	= {USenglish},
+  pdf		= {https://www.brucker.ch/bibliography/download/2006/brucker.ea-mda-2006-b.pdf},
+  title		= {An {MDA} Framework Supporting {OCL}},
+  url		= {https://www.brucker.ch/bibliography/abstract/brucker.ea-mda-2006-b},
+  volume	= {5},
+  year		= {2006}
+}
+