%0 Journal Article %K High temperature superconductors %K Superconducting materials %K Yttrium barium copper oxides %K Oxide superconductors %K Microscopic Examination - Transmission Electron Microscopy %K Crystals - Structure %K Oxides - Electric Conductivity %K Bismuth Cuprates %K Polytypoidic Stacking Units %K Polytypoidism %A Ramamoorthy Ramesh %A D.M Hwang %A T.S Ravi %A C.C Chang %A A Inam %A X.D Wu %A T Venkatesan %A J.M Tarascon %A S.M Green %B Materials Letters %D 1990 %G eng %P 357-364 %R 10.1016/0167-577X(90)90066-U %T Polytypoidic structures in high temperature oxide superconductors %V 9