K. Kowalska and I. Kowalik, “Challenges faced by SMEs in their digital transformation towards Industry 4.0”, in Contemporary organisation and management. Challenges and trends, A. Michałkiewicz and W. Mierzejewska, Eds. Poland: Lodz University Press, 2020, pp. 35–48. doi: 10.18778/8220-333-2.02.