Cahyono AN, Masrukan, Mulyono, Ludwig M, Jablonski S, Oehler D-XK. Indonesia-Germany MathCityMap training: Shifting mobile math trails teacher training to a hybrid environment. j. math. educ. [Internet]. 2023 Feb. 22 [cited 2024 May 20];14(1):55-68. Available from: http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/309