Acknowledgements

I would like to thank the following people for all their effort, motivation, and support during teaching: President of Haybusak University Dr. Anahit Harutyunian, Rector Dr. Suren Harutyunyan, Dean Dr. Yanina Marinosyan, Vice-Dean Dr. Narine Martirosyan, and Drs. Lusine Hovsepyan and Astghik Harutyunyan.
