Defined in file biblio.asn
C++ class: CCitRetract
CitRetract ::= SEQUENCE {
type ENUMERATED { -- retraction of an entry
retracted (1) , -- this citation retracted
notice (2) , -- this citation is a retraction notice
in-error (3) , -- an erratum was published about this
erratum (4) } , -- this is a published erratum
exp VisibleString OPTIONAL } -- citation and/or explanation