By Bernal Antonio   Sánchez Miguel   in Letters in Mathematical Physics

ISSN:0377-9017|77|2|183-197

Springer Publishing Company ‎(2006)‎

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By Chávez Basilio Verduzco   Bernal Antonio Sánchez   in Impact Assessment and Project Appraisal

ISSN:1471-5465|26|3|163-176

Taylor & Francis Ltd‎(2008)‎

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