We introduce two classes of graphs, Indonesian graphs and $k$-doughnut graphs. Cycle double covers are constructed for these classes. In case of doughnut graphs this is done for the values $k=1,2,3$ and 4.
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机译：我们介绍两类图，印度尼西亚图和$ k $-甜甜圈图。为这些类别构造了自行车双盖。如果是甜甜圈图，则对值$ k = 1,2,3 $和4进行此操作。
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