| http://www.w3.org/ns/prov#value | - In a paper presented in Nov. of 1987 by Robert B Laibowitz and entitled Vapor Deposited High Tc Superconducting Oxide Thin Films" it was reported that thin films of the compound YBa2 Cu3 Oy were deposited on substrates such as sapphire, MgO, ZrO2, SrTiO3, Si and SiO2.
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