1 Correction to: Swarm Intell (2018) 12:23–51 https://doi.org/10.1007/s11721-017-0142-9

The original version of this article unfortunately contained a mistake. The presentation of Equation (21) was incorrect. The corrected equation is given below.

$$ J_{\theta } : = \int {p_{{\mathcal{R}}} (\tau\,|\,\theta )\tau \,{\text{d}}\tau .} $$
(21)