http://core.ac.uk/download/pdf/37826793.pdf
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http://www.researchgate.net/profile/Fabio_Paterno/publication/221105994_Tools_for_Task_Modelling_Where_we_are_Where_we_are_headed/links/55941aa808ae5d8f392f58c6/Tools-for-Task-Modelling-Where-we-are-Where-we-are-headed.pdf
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