Ryökkynen, S., R. Pirttimaa, and E. Kontu. “Interaction Between Students and Class Teachers in Vocational Education and Training: ‘Safety Distance Is needed’”. Nordic Journal of Vocational Education and Training, vol. 9, no. 2, Jan. 2020, pp. 156-74, doi:10.3384/njvet.2242-458X.1992156.