What's the status of international oil companies in Venezuela after Maduro's capture?

Here are key facts about international oil companies in Venezuela, a country with the world's largest oil reserves thrown into crisis by the capture of President Nicolas Maduro by U.S. forces.
IEEE

Blind Separation of Quasi-Stationary Sources: Exploiting Convex Geometry in Covariance Domain

Abstract: This paper revisits blind source separation of instantaneously mixed quasi-stationary sources (BSS-QSS), motivated by the observation that in certain applications (e.g., speech) there exist ...
IEEE

Two New Algorithms for Maximum Likelihood Estimation of Sparse Covariance Matrices With Applications to Graphical Modeling

Abstract: In this paper, we propose two new algorithms for maximum-likelihood estimation (MLE) of high dimensional sparse covariance matrices. Unlike most of the state-of-the-art methods, which either ...