%% You should probably cite rfc7114 instead of this I-D. @techreport{leiba-smime-type-registry-00, number = {draft-leiba-smime-type-registry-00}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-leiba-smime-type-registry/00/}, author = {Barry Leiba}, title = {{Creation of a registry for smime-type parameter values}}, pagetotal = 4, year = 2013, month = aug, day = 28, abstract = {Secure/Multipurpose Internet Mail Extensions (S/MIME) defined the Content-Type parameter "smime-type". As the list of defined values for that parameter has increased, it has become clear that a registry is needed to document those values. This document creates that registry, registers the current values, and specifies the policies for registration of new values.}, }