We show basic facts about dp-minimal ordered structures. The main results are: dp-minimal groups are abelian-by-finite-exponent, in a divisible ordered dp-minimal group, any infinite set has non-empty interior, and any theory of pure tree is dp-minimal.
Pierre Simon. "On dp-minimal ordered structures." J. Symbolic Logic 76 (2) 448 - 460, June 2011. https://doi.org/10.2178/jsl/1305810758