Improved bibtex entries

Alexandre Clément and Simon Perdrix, PBS-Calculus: A Graphical Language for Coherent Control of Quantum Computations. 45th International Symposium on Mathematical Foundations of Computer Science (MFCS 2020), August 2020, Prague, Czech Republic (held online). pp.24:1-24:14 [HAL] [doi] [arXiv] [Bibtex (corrected)].

Cyril Branciard, Alexandre Clément, Mehdi Mhalla and Simon Perdrix, Coherent Control and Distinguishability of Quantum Channels via PBS-Diagrams. 46th International Symposium on Mathematical Foundations of Computer Science (MFCS 2021), August 2021, Tallinn, Estonia (hybrid event). pp.24:1-24:14 [HAL] [doi] [arXiv] [Bibtex (corrected)].