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Direct proofs of the undecidability of the equivalence problem for sentential forms of linear context-free grammars and the equivalence problem for OL systemsG. Rozenberg · 1972
Power languages and densityValtteri Niemi · 1991
Secure multiparty computations without computersValtteri Niemi; Ari Renvall · 1998
Trends in mobile security standardsValtteri Niemi · 2004
Editorial for the LTE special sectionValtteri Niemi · 2010
Distributed Usage ControlDebmalya Biswas; Nikolai Nefedov; Valtteri Niemi · 2011
Distributed and minimal usage controlDebmalya Biswas, Nikolai Nefedov, Valtteri Niemi · Service Oriented Computing and Applications · 2012
Fragmentation algorithms for DTN linksGinzboorg, Philip; Niemi, Valtteri; Ott, Jörg · Computer Communications · 2013
Density of grammar forms part IINiemi, Valtteri · International Journal of Computer Mathematics · 1986