Ignasi Sau Dimitrios M. Thilikos Subexponential Parameterized Algorithms for Bounded-Degree Connected Subgraph Problems on Planar Graphs. 59-66 2009 32 Electronic Notes in Discrete Mathematics http://dx.doi.org/10.1016/j.endm.2009.02.009 db/journals/endm/endm32.html#SauT09