%0 Journal Article %A C.J.D Hetherington %A Ramamoorthy Ramesh %A M.A O'Keefe %A R Kilaas %A G Thomas %A S.M Green %A H.L Luo %B Applied Physics Letters %D 1988 %G eng %P 1016-1018 %R 10.1063/1.100074 %T High-resolution electron microscopy of the c=30.5 Å and c=38.2 Å polytypoids in the Bi-Ca-Sr-Cu-O superconductor %V 53