Journal of Automata, Languages and Combinatorics formerly:
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@article{jalc070102, author = {Joost Engelfriet and Zolt\'{a}n F\"{u}l\"{o}p and Heiko Vogler}, title = {Bottom-Up and Top-Down Tree Series Transformations}, journal = jalc, year = 2002, volume = 7, number = 1, pages = {11--70} }