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Jun Wang, Huajun Zhang. Intersecting families in $\left( {\begin{array}{c}{[m]}\\ \ell \end{array}}\right) \cup \left( {\begin{array}{c}{[n]}\\ k\end{array}}\right) $. J. Comb. Optim., 40(4):1020-1029, 2020. [doi]
Abstract is missing.