@
article{Pilling,
author = {Pilling, D. L.},
title = {Commutative Regular Equations and {Parikh
's} Theorem},
journal = {
Journal of the London Mathematical Society},
volume = {s2-
6},
number = {
4},
pages = {
663-
666},
note = {
\url{
https://doi.org/10.
1112/jlms/s2-
6.
4.
663}},
year = {
1973}
}
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