Polish Air Force University,

Demblin city, Poland

Bratislava University of Economics and Management,

Bratislava city, Slovakia

Nicolae Testemițanu State University of Medicine and Pharmacy,

Chisinau city, Republic of Moldova

University of Economics and Humanities,

Bielsko-Biala city, Poland

L.N. Gumilyov Eurasian National University,

Nur-Sultan city, Republic of Kazakhstan

University of Žilina,

Zhilin city, Slovak Republic

Airbus Helicopters,

Marinyan city, France

University of Ljubljana,

Ljubljana city, Republic of Slovenia

International Business School,

Botevgrad city, Bulgaria

University of Niš,

м. Nish, Serbia

School complex no. 18,

Wroclaw city, Poland

Private institution Bolashak Academy,

Karaganda city, Republic of Kazakhstan

University of Life Sciences in Lublin,

Lublin city, Poland

Stefan cel Mare University of Suceava,

Suceava city, Romania

D. Serikbayev East Kazakhstan technical university,

Ust-Kamenogorsk city, Republic of Kazakhstan

The Technical University of Gabrovo,

Gabrovo city, Republic of Bulgaria

The Technical University of Sofia,

Sofia city, Republic of Bulgaria

University of Agribusiness and Rural Development,

Plovdiv city, Republic of Bulgaria

Center of Pediatrics named after John Paul II in Sosnowiec,

Sosnowiec city, Poland