Evans, W. D. ., Karadzhov, G. E. y Edmunds, D. E. (2007): «Sharp Estimates of the Embedding Constants for Besov Spaces bs p,q, 0 < p < 1», Revista Matemática Complutense, 20(2), pp. 445–462. doi: https://doi.org/10.5209/rev_REMA.2007.v20.n2.16505.