q-Strong Bilinear Diffie-Hellman I'm having trouble finding the first paper that introduced the $q$-Strong Bilinear Diffie-Hellman ($q$-SBDH) assumption which, roughly speaking, is:

Let $\mathbb{G},\mathbb{G}_T$ be two groups of order $p$, with a bilinear map $e$ from $\mathbb{G}$ to $\mathbb{G}_T$.
Let $s \stackrel{$}{\leftarrow} \mathbb{Z}^*_p$ be a trapdoor. Given $pp = \langle g, g^s, g^{s^2},..., g^{s^q} \rangle \in  \mathbb{G}^{q+1}$, an adversary has negligible probability of finding $\langle c, e(g, g)^{\frac{1}{s+c}} \rangle$ for some $c \in \mathbb{Z_p} \setminus \{-s\}$.

Some papers seem to point to Dan Boneh's "Short signatures without random oracles and the SDH assumption in bilinear groups" (Journal of Cryptography, 2008). However, as far as I've read the paper, only $q$-SDH is defined there, not $q$-SBDH.

Any help would be appreciated!
After some more investigation, the earliest paper I could find that introduces $q$-Strong Bilinear Diffie-Hellman was Reducing Trust in the PKG in Identity Based Cryptosystems by Vipul Goyal in CRYPTO 2007.