\input zb-basic
\input zb-ioport
\iteman{io-port 05984026}
\itemau{Shen, Xiaoling; Hou, Yaoping}
\itemti{The sandpile group of a bilateral regular tree.}
\itemso{Australas. J. Comb. 51, 61-75 (2011).}
\itemab
Summary: Let $T_n$ be a $(d-1)$-ary tree of height $n$. A bilateral regular tree is the multigraph $T^d_{n,n}$ that is defined by: { indent=7mm \item{(i)}juxtaposing two $T_n$'s, \item{(ii)}drawing a new edge between two roots and \item{(iii)}drawing $d-1$ edges between each leaf and a new vertex, called the sink. } The sandpile group of $T^d_{n,n}$ is determined.
\itemrv{~}
\itemcc{}
\itemut{}
\itemli{}
\end