  This article is an invitation to read a famous text of Roger Ap{\'e}ry,
"Math{\'e}matique constructive", published in the book "Penser les
math{\'e}matiques: s{\'e}minaire de philosophie et math{\'e}matiques de
l'{\'E}cole normale sup{\'e}rieure (J. Dieudonn{\'e}, M. Loi, R. Thom)"
[arXiv:1705.05581]. It also proposes a commented bibliography for constructive
mathematics and a technical note on measure theory.
