BLAGA, Paul A. Gerard Walschap, Multivariable Calculs and Differential Geometry, Walter de Gruyter (De Gruyter Graduate), 2015, ix+355 pages, Paperback, ISBN 978-3-11- 036949-6. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 60, n. 4, p. 625–626, 2015. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5842. Acesso em: 5 feb. 2025.