RSA-KEM is introduced by Yuliang Zheng and Jennifer Seberry
and compared the security against OAEP variant by Jakob Jonsson, in 2002
I've found some documents that may indicate the usage of RSA-KEM in the wild.
- rfc5990: Use of the RSA-KEM Key Transport Algorithm in the Cryptographic Message Syntax (CMS)
- Key Encapsulation: A New Scheme for Public-Key Encryption by XML Security Working Group F2F, May 2009
What are the noticeable usage of RSA-KEM in the wild as of 2020?