Bratychak, Мichael     Functional oligomers based on fhenol-formaldehyde resins [Текст] / Мichael Bratychak, Halyna Zubyk // 4th International caucasian symposium on polymers & advanced materials ICSP&AM4 : abstracts, 1-4 July 2015, Batumi, Georgia / Min. of Education and Science of Georgia, Iv. Javakhishvili Tbilisi State Univ. — 2015. — P. 20.