text xx Switzerland Springer Nature 9999 9999 continuing Quarterly und Print+Free Online ; Print : Vol.44,47-48 ; Gaps in Holdings : Vol.45-46. Online : Vol.49 till now ; Gaps in E-Holdings : Vol.1-48. 0973-7707 2231-3796 https://link.springer.com/journal/12070/volumes-and-issues https://link.springer.com/journal/12070/volumes-and-issues 220617 20220625151008.0