Akanksha Agrawal, N. R. Aravind, Subrahmanyam Kalyanasundaram, Anjeneya Swami Kare, Juho Lauri, Neeldhara Misra, I. Vinod Reddy. Parameterized complexity of happy coloring problems. Theoretical Computer Science, 835:58-81, 2020. [doi]
Abstract is missing.