Approximate Spreading Activation for Efficient Knowledge Retrieval from Large Datasets. - Maurice Grinberg; Vladimir Haltakov; Hristo Stefanov (WIRN, 2010)

How to Do Successful Chargeback for Cloud Services. - Hristo Stefanov; Slinger Jansen; Ronald Batenburg; Eugene van Heusden; Ravi Khadka (GECON, 2011)

Chargeback for cloud services. - Thijs Baars; Ravi Khadka; Hristo Stefanov; Slinger Jansen; Ronald Batenburg; Eugene van Heusden (Future Gener. Comput. Syst., 2014)