Please visit the main page for context information. This page is intended to provide references about the discovery date and characteristics of Sirius C, as someone has falsely alleged to me that Sirius C was discovered in 1921.
Here is the source of the original scientific paper: http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query?1995A%26A...299..621B (NASA Astrophysics Data System (ADS), at Harvard University)
As such web pages tend to disappear over time, I reproduced the paper below: