Coronal Conditions for the Occurrence of Type II Radio Bursts
                         
                    
                    
                    
                        - Authors: Athanasios Kouloumvakos, Alexis Rouillard, Alexander Warmuth, Jasmina Magdalenic, Immanuel. C. Jebaraj, Gottfried Mann, Rami Vainio, and Christian Monstein
                        
                        2021 The Astrophysical Journal 913
                         99.