Aviezri S. Fraenkel, Yaacov Yesha. The generalized Sprague-Grundy function and its invariance under certain mappings. Journal of Combinatorial Theory, Series A, 43(2):165-177, 1986. [doi]
@article{FraenkelY86,
title = {The generalized Sprague-Grundy function and its invariance under certain mappings},
author = {Aviezri S. Fraenkel and Yaacov Yesha},
year = {1986},
doi = {10.1016/0097-3165(86)90058-0},
url = {http://dx.doi.org/10.1016/0097-3165(86)90058-0},
researchr = {https://researchr.org/publication/FraenkelY86},
cites = {0},
citedby = {0},
journal = {Journal of Combinatorial Theory, Series A},
volume = {43},
number = {2},
pages = {165-177},
}