Sequence of 9 Primes of form 4n+1/Historical Note

Historical Note on Sequence of $9$ Primes of form $4 n + 1$
In his of $1986$,  reports that  discusses this in his  of $1981$.

In of $1997$, he then attributes this result to a certain Den Haan, but gives no context.

It remains to identify who this is.