Datt G. On Lappan’s five-valued theorem for $\varphi$-normal functions in several variables. Ukr. Mat. Zhurn. [Internet]. 2022 Nov. 8 [cited 2025 Dec. 5];74(9):1284-90. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/6237