“…As a result, there exists a wealth of detailed literature on overall source sampling procedures [18,35,42,45,189,190] and standardized source sampling techniques [36-41, 44, 191-193]. As a result, there exists a wealth of detailed literature on overall source sampling procedures [18,35,42,45,189,190] and standardized source sampling techniques [36-41, 44, 191-193].…”