Bal yul mchod rten rnam gsum la ñams gsoʼi sri źu mdzad tshul : an account of Rtogs-ldan Śākya-śrī's restorations of the three great Buddhist stupas of the Kathmandu Valley - Kaḥ-thog Si-tu Chos-kyi-rgya-mtsho, 1880-1925 (Sherab Gyaltsen, 1983)