Software Verification : 13th International Conference, VSTTE 2021, New Haven, CT, USA, October 18-19, 2021, and 14th International Workshop, NSV 2021, Los Angeles, CA, USA, July 18-19, 2021, Revised Selected Papers - Bloem, Roderick; Dimitrova, Rayna; Fan, Chuchu; Sharygina, Natasha (Cham Springer International Publishing AG, 2022)