"The Theory of Analytic Functions: A Brief Course" is a book on complex analysis written by Aleksei Ivanovich Markushevich. It's a well-regarded textbook, often referred to as simply "Markushevich's book," and is known for its clear and accessible presentation of the subject matter. The book is designed to be suitable for students, particularly those in physico-mathematical faculties, and includes numerous examples to illustrate the concepts and methods. The book covers the fundamental concepts and theorems of complex analysis, including analytic functions, conformal mappings, and Cauchy's integral formula.