Changes

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* Smullyan, R.,

* Smullyan, R., ''To Mock a Mockingbird : And Other Logic Puzzles Including an Amazing Adventure in Combinatory Logic'', Alfred A. Knopf, New York, NY, 1985.

  'To Mock a Mockingbird: And Other Logic Puzzles

    Including an Amazing Adventure in Combinatory Logic',

    Alfred A. Knopf, New York, NY, 1985.

* Sowa, J.F.,

* Sowa, J.F., ''Conceptual Structures : Information Processing in Mind and Machine'', Addison-Wesley, Reading, MA, 1984.

  'Conceptual Structures: Information Processing in Mind and Machine',

    Addison-Wesley, Reading, MA, 1984.

* Sowa, J.F. (ed.),

* Sowa, J.F. (ed.), ''Principles of Semantic Networks : Explorations in the Representation of Knowledge'', Morgan Kaufmann, San Mateo, CA, 1991.

  'Principles of Semantic Networks:

    Explorations in the Representation of Knowledge',

    Morgan Kaufmann, San Mateo, CA, 1991.

* Spencer-Brown, G.,

* Spencer-Brown, G., ''Laws of Form'', George Allen and Unwin, London, 1969.

  'Laws of Form',

    George Allen & Unwin, London, 1969.

* Spivak, M.,

* Spivak, M., ''A Comprehensive Introduction to Differential Geometry'', 2nd edition, Publish or Perish Incorporated, Houston, TX, 1979.

  'A Comprehensive Introduction to Differential Geometry',

    Second Edition, Publish or Perish Incorporated, Houston, TX, 1979.

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