@article{Werner_2022, title={The Perfekt theory of $M$-ideals}, volume={128}, url={https://www.mscand.dk/article/view/132230}, DOI={10.7146/math.scand.a-132230}, abstractNote={<p>We revisit some ideas of K.-M. Perfekt who has provided an elegant framework to detect the biduality between function or sequence spaces defined in terms of some $o$- respectively $O$-condition. We present new proofs under somewhat weaker assumptions than before and apply the result to Lipschitz spaces.</p>}, number={2}, journal={MATHEMATICA SCANDINAVICA}, author={Werner, Dirk}, year={2022}, month={Jun.} }