copula

n.

系动词（如be,seem,appear等），（命题主词与谓词间的）连系；

复数：copulas

1. Copula is used with an adjective or a predicate noun.
   系动词是与形容词或者谓语性名词连用。

Copula Method in Finance
Copula technique and financial risk analysis
Copula Modeling: An Introduction for Practitioners
Pair-copula constructions of multiple dependence
连接函数(copula)技术与金融风险分析
On Default Correlation: A Copula Function Approach
Dynamic copula models for multivariate high-frequency data in Finance
The Copula-GARCH model of conditional dependencies: An international stock market application
Contraction, Deletion, and Inherent Variability of the English Copula
Dependence between Non-Energy Commodity Sectors Using Time-Varying Extreme Value Copula Methods