Robert A. Proctor, Michael E. Saks, Dean G. Sturtevant. Product partial orders with the sperner property. Discrete Mathematics, 30(2):173-180, 1980. [doi]
@article{ProctorSS80,
title = {Product partial orders with the sperner property},
author = {Robert A. Proctor and Michael E. Saks and Dean G. Sturtevant},
year = {1980},
doi = {10.1016/0012-365X(80)90118-1},
url = {http://dx.doi.org/10.1016/0012-365X(80)90118-1},
researchr = {https://researchr.org/publication/ProctorSS80},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {30},
number = {2},
pages = {173-180},
}