Developing Rigorous Mathematical Thinking Approach-Based Learning Materials for Sequences and Series Concept at High School Level in TanjungpinangPuji Astuti, Febrian Febrian, Weni Dwi Pratiwi, Hutami Sukma Hayati, Yolanda Dhita Aruny and Sheila DiniatiBIO Web Conf., 79 (2023) 05005DOI: https://doi.org/10.1051/bioconf/20237905005