Update README.md

Author: sichkar-valentyn

README.md

@@ -5,9 +5,6 @@ Implementing Reinforcement Learning (RL) Algorithms for global path planning in
 ### Courses:
 * Explore the course **"Convolutional Neural Networks for Image Classification"** here: https://stepik.org/course/53801/promo
 
-### Reference to:
-Valentyn N Sichkar. Reinforcement Learning Algorithms for global path planning // GitHub platform. DOI: 10.5281/zenodo.1317898
-
 ### Related works:
 * Sichkar V. N. "Reinforcement Learning Algorithms in Global Path Planning for Mobile Robot", 2019 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM), Sochi, Russia, 2019, pp. 1-5. doi: <a href="https://doi.org/10.1109/ICIEAM.2019.8742915" target="_blank">10.1109/ICIEAM.2019.8742915</a> (Full-text available also here <a href="https://www.researchgate.net/profile/Valentyn_Sichkar" target="_blank">ResearchGate.net/profile/Valentyn_Sichkar</a>)