In a paper, the authors Jonah-Konvisser say

Until recently (~1975), there were no published examples of non-abelian groups with abelian automorphism groups. Heinken and Liebeck have methods for constructing such $p$-groups;.....

When I saw the paper of Heinken and Liebeck, I saw that much of their work involves construction of following object: *given a group $K$ with $|K|\geq 5$, construct a $p$-group $G$ of class $2$ and exponent $p^2$ such that $\mathrm{Aut}(G)/\mathrm{Aut}_\mathrm{c}(G)$ is isomorphic to $K$.* [Here $\mathrm{Aut}_\mathrm{c}(G)$ is the set of those automorphisms of $G$ which are identity on $G/Z(G)$.]

So, I didn't find the place in which they construct groups with abelian automorphism group; this confused me with quoted statement from paper of Jonah-Konvisser.

**Question:** Can one indicate me where, Heinken and Liebeck do construction of non-abelian $p$-groups with abelian automorphism group?