@article{BASM_2018_1_a2, author = {Iryna Fryz}, title = {Orthogonality and retract orthogonality of operations}, journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica}, pages = {24--33}, publisher = {mathdoc}, number = {1}, year = {2018}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BASM_2018_1_a2/} }