The first part of the paper answers the question whether two different continua, each irreducible between the same pair of points could have a sum irreducible between two of its points. The second part shows certain properties of continua irreducible between the same pair of points and having the above mentioned property with respect to their sum.
@article{bwmeta1.element.bwnjournal-article-fmv7i1p28bwm, author = {John Kline}, title = {Concerning the sum of two continua each irreducible between the same pair of points}, journal = {Fundamenta Mathematicae}, volume = {7}, year = {1925}, pages = {314-322}, zbl = {51.0461.01}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv7i1p28bwm} }
Kline, John. Concerning the sum of two continua each irreducible between the same pair of points. Fundamenta Mathematicae, Tome 7 (1925) pp. 314-322. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv7i1p28bwm/