@article{ASCFM_1967__35_4_25_0, author = {Shepherdson, J. C.}, title = {The rule of induction in the three variable arithmetic based on $+$ and $-$}, journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques}, volume = {37}, year = {1967}, pages = {25-31}, mrnumber = {276089}, language = {en}, url = {http://dml.mathdoc.fr/item/ASCFM_1967__35_4_25_0} }
Shepherdson, J. C. The rule of induction in the three variable arithmetic based on $+$ and $-$. Annales scientifiques de l'Université de Clermont. Mathématiques, Tome 37 (1967) pp. 25-31. http://gdmltest.u-ga.fr/item/ASCFM_1967__35_4_25_0/
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