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Helsinki University Library has acquired sets of hundreds of e-books from a few publishers and providers and made them accessible for a certain period to the students and staff of the university by cataloguing them in the HELKA database. The most popular titles in each set will be acquired permanently.
These kinds of acquisition models are called:
- PDA – Patron Driven Acquisition or
- EBA – Evidence Based Acquisition or
- EBS – Evidence Based Selection or
- DDA – Demand Driven Acquisition