Heijst, E. J. L. J. v. (1992). Special signature schemes. s.n.].
Lua i Stíl Chicago (17ú heag.)Heijst, Eugène Josephus Leonardus Johannes van. Special Signature Schemes. [S.l.: s.n.], 1992.
Lua MLA (8ú heag.)Heijst, Eugène Josephus Leonardus Johannes van. Special Signature Schemes. s.n.], 1992.
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