@article{701866,
     title = {s-numbers of diagonal operators and Besov embeddings},
     booktitle = {Proceedings of the 13th Winter School on Abstract Analysis},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1985},
     pages = {[83]-110},
     mrnumber = {MR0894275},
     zbl = {0611.47015},
     url = {http://dml.mathdoc.fr/item/701866}
}

Linde, Rainer. s-numbers of diagonal operators and Besov embeddings, dans Proceedings of the 13th Winter School on Abstract Analysis, GDML_Books,  (1985), pp. [83]-110. http://gdmltest.u-ga.fr/item/701866/