Druide
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Semiosis
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Furies Déchaînées
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Sorcières
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The Art of Insight in Science and Engineering
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Calculus made easy
Silvanus P. Thompson, Martin Gardner
Incompleteness and Computability
Open Logic Project
Fundamentals of algebraic graph transformation
Hartmut Ehrig, Kasten Ehrig, Urlike Prange, Gabriele Taentzer