PbSrYCaCuO : a new class of superconducting materials. Chemical analyses refined by Energy Dispersive X-rays M. Gasgnier, P. Tremblay, R. Suryanarayanan, H. Pankowska, M. Rateau et O. GorochovRev. Phys. Appl. (Paris), 25 1 (1990) 39-44DOI: https://doi.org/10.1051/rphysap:0199000250103900