Bo Cui Lila Kari Shinnosuke Seki On the Reversibility of Parallel Insertion, and Its Relation to Comma Codes. 204-219 2009 CAI http://dx.doi.org/10.1007/978-3-642-03564-7_13 conf/cai/2009 db/conf/cai/cai2009.html#CuiKS09