Various sources including texts provide सूत्रs for स्वरसन्धि and हल्सन्धि. But I cannot find the same for the different types of विसर्गसन्धि [आदेश (उ, स्, रेफ, जिह्वामूलीय उपध्मानीय) and, लोप]. Are they compiled together or even separately in an accessible site? Thank you.