Publisher Correction: International Journal of Theoretical Physics (2021)

https://doi.org/10.1007/s10773-019-04067-x ;

https://doi.org/10.1007/s10773-020-04460-x

These articles were published twice due to an oversight during the processing of the new submission of the manuscripts.

https://link.springer.com/article/10.1007/s10773-019-04067-x

https://link.springer.com/article/10.1007/s10773-020-04460-x

The publisher wishes to apologize for this mistake.