HREM investigation of n = 4 members of the tubular bismuth cuprates (Bi2+xSr2-xCUO6)n (Sr8Cu6O16+y) Bernadette Domengès, Maria Teresa Caldes, Maryvonne Hervieu, Amparo Fuertes and Bernard Raveau Microsc. Microanal. Microstruct., 3 5 (1992) 415-431 DOI: 10.1051/mmm:0199200305041500