@article{Wójcik_2018, title={$k$-smoothness: an answer to an open problem}, volume={123}, url={https://www.mscand.dk/article/view/102834}, DOI={10.7146/math.scand.a-102834}, abstractNote={<p>The aim of this paper is to characterize the $k$-smooth points of the closed unit ball of $\mathcal{K}(\mathcal{H}_1;\mathcal{H}_2)$. In this paper we also answer a question posed by A. Saleh Hamarsheh in 2015.</p>}, number={1}, journal={MATHEMATICA SCANDINAVICA}, author={Wójcik, Paweł}, year={2018}, month={Aug.}, pages={85–90} }