Privacy implications of context-aware services. - Were Oyomno; Pekka Jäppinen; Esa Kerttula (COMSWARE, 2009)

Privacy Policy Enforcement for Ambient Ubiquitous Services. - Were Oyomno; Pekka Jäppinen; Esa Kerttula (AmI, 2010)

Usability study of ME2.0 - User interface design for mobile context enhanced personalisation software. - Were Oyomno; Pekka Jäppinen; Esa Kerttula; Kari Heikkinen (Pers. Ubiquitous Comput., 2013)

A novel federated strong mobile signature service - The Finnish case. - Esa Kerttula (J. Netw. Comput. Appl., 2015)