Let G denote a graph and k2 be an integer. A \K₁, ₁, K₁, ₂, , K₁, ₊, T (2k+1) \-factor of G is a spanning subgraph, whose every connected component is isomorphic to an element of \K₁, ₁, K₁, ₂, , K₁, ₊, T (2k+1) \, where T (2k+1) is one special family of tree. In this paper, we put forward some sufficient conditions for the existence of \K₁, ₁, K₁, ₂, , K₁, ₊, T (2k+1) \-factors in graphs. Furthermore, we construct some extremal graphs to show that the main results in this paper are best possible.
Sizhong Zhou (Fri,) studied this question.