A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
undefined language relationshipuse @lang-focus
undisclosed authorsee <anonymous>
Uniform Resource Identifieruse <uri>
Uniform Resource Identifier (URI)
unique identifiersee @id
units of measuresee <size>use @units
universitysee <aff>see <institution>
university degreeuse <degrees>
University faculty IDsee @contrib-id-type
unknown, authorsee <anonymous>
unknown language variantuse @lang-variant
unordered listsee <list>
unprinted itemsee <supplementary-material>
unprinted-itemsee @supplemental
unstructured citation textsee <comment>
URI for This Same Article Online
URLsee <ext-link>see <self-uri>see <uri>