L. Lami and Giovannetti, V.,
“Entanglement-saving channels”,
Journal of Mathematical Physics, vol. 57, no. 3, p. 032201, 2016.
V. I. Paulsen, Severini, S., Stahlke, D., Todorov, I. G., and Winter, A.,
“Estimating quantum chromatic numbers”,
Journal of Functional Analysis, vol. 270, no. 6, pp. 2188-2222, 2016.