@article {IOPORT.50329428,
    author       = {Schlimm, Dirk},
    title        = {Learning from the existence of models: on psychic machines, tortoises, and computer simulations},
    year         = {2009},
    journal      = {Synthese},
    volume       = {169},
    number       = {3},
    pages        = {521-538},
    doi          = {10.1007/s11229-008-9432-5},
    identifier   = {50329428},
}