MTYMEX 2021 -- Chapter 1. A Location-based Mobile Advertising System for Small-to-Medium Businesses -- Chapter 2. Cyber Threat Intelligence Methodologies: Hunting Cyber Threats with Threat Intelligence Platforms and Deception techniques -- Chapter 3. Probabilistic update policy to deal with bandits for staged problems applied to Cases -- Chapter 4. Virtual Job Expo: A Practical Approach to Virtual Reality in Different Development Engines -- Chapter 5. Towards the comprehensive detection of fake news in socio-digital media in Mexico with machine learning -- Chapter 6. Virtual reality training simulation for controlled land unmanned vehicle: a feasibility model -- Chapter 7. Data-Driven Cyber Threat Intelligence: a survey of Mexican territory -- Chapter 8. Fusion of Digital Mammography with High Resolution Breast PET: An Application to Breast Imaging -- Chapter 9. A model for the control and monitoring of supply chain indicators -- Chapter 10. Parking Slots: the last mile literature review -- Chapter 11. Technologies in education for visually impaired people: a literature review -- Chapter 12. sEMG Classification of Upper Limb Movements under different loads.