First-order queries on structures of bounded degree are computable with constant delay.

Arnaud Durand Etienne Grandjean First-order queries on structures of bounded degree are computable with constant delay. 2007 8 ACM Trans. Comput. Log. 4 http://doi.acm.org/10.1145/1276920.1276923 db/journals/tocl/tocl8.html#DurandG07