You seem to be attempting to access an item that has been removed from the repository.
There is an alternative version of the item you are trying to access:
Henrio, Ludovic and Kammueller, Florian and Lutz, Bianca (2012) ASPfun: a typed functional active object calculus. Science of Computer Programming, 77 (7-8). pp. 823-847. ISSN 0167-6423