Open Access
Published online: 28 February 2019
DOI: 10.1140/epjti/s40485-019-0050-z
Open Access
Published online: 16 August 2019
DOI: 10.1140/epjti/s40485-019-0051-y
Open Access
Published online: 18 December 2019
DOI: 10.1140/epjti/s40485-019-0052-x