中国科学院数学与系统科学研究院期刊网
可量词消去的带根节点的树理论
傅莺莺, 沈复兴
The Classification of All Quantifier-Eliminable Directed or Undirected Trees with a Root
Ying Ying FU, Fu Xing SHEN
数学学报 . 2015, (4): 691 -704 .  DOI: 10.12386/A2015sxxb0071