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Digital signatures in interoperable electronic servicesTepandi, JaakBaltic ITAMPT review2003 / 3, p. 62-65 https://artiklid.elnet.ee/record=b2025607*est

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Interoperability of digital signatures - a priority in Northern eSecurityTepandi, Jaak; Ott, ArvoBaltic ITAMPT review2002 / 2, p. 42-44 https://artiklid.elnet.ee/record=b2024788*est

Keyless signature infrastructure and PKI : hash-tree signatures in pre- and post-quantum worldBuldas, Ahto; Laanoja, Risto; Truu, AhtoInternational journal of services technology and management2017 / p. 117-130 : ill http://dx.doi.org/10.1504/IJSTM.2017.10002708

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