@article{paperid:1082320, author = {Garousi, Mohammad Reza}, title = {Minimal gauge invariant couplings at order $$\alpha '^3$$: NS–NS fields}, journal = {The European Physical Journal C}, year = {2020}, volume = {80}, number = {11}, month = {November}, issn = {1434-6052}, keywords = {Effective action; gauge symmetry}, }