V. NAGA RAJU; G. UPENDER REDDY. Common fixed point theorem for four self maps of \(S\)-metric spaces by employing compatibility of type(R). Malaya Journal of Matematik, India, v. 8, n. 04, p. 1735–1742, 2020. DOI: 10.26637/MJM0804/0069. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/1738. Acesso em: 2 jun. 2024.