This article has no associated abstract. ( fix it )doi:10.1111/j.1746-8361.1956.tb01424.xDoyon, AParis et GrenobleLiaigre, LParis et GrenobleBlackwell Publishing LtdDialectica
doi:10.1002/zamm.19540340859Neuber, NWILEY‐VCH VerlagZamm ‐ Journal of Applied Mathematics & Mechanics