Geodesic
Presentation of Natural Deduction
Zbornik radova, Tome 2 (1977) no. 10, p. 115 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

The merits of a system of natural deduction are not only determined by its value as a logical system in itself. Since it formalizes deductions in a manner close to intuitive reasoning, natural deduction can also be used as a (logical) framework for mathematical argumentation. One may say that many mathematical texts are tacitly based on a form of natural deduction, as regards the logical part of the deductive patterns. 
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     author = {R. P. Nederpelt},
     title = {Presentation of {Natural} {Deduction}},
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R. P. Nederpelt. Presentation of Natural Deduction. Zbornik radova, Tome 2 (1977) no. 10, p. 115 . http://geodesic.mathdoc.fr/item/ZR_1977_2_10_a8/