Definition:Sociable Chain/Historical Note

Historical Note on Sociable Chain
The concept of a sociable chain was discussed by, who wrote a paper on the subject.

The next sociable chains to be discovered were found in $1969$ and published in $1970$ by, who found $9$ of them, all of order $4$.

Several more have been found since, by various people, including, , and.

Most of these are of order $4$, but two are of order $8$ and one of order $9$

Even more recently, $5$ sociable chains of order $6$ have been discovered.