Original: A Treaty of friendship and alliance between the Government of Mongolia and Tibet was signed on February 2Udo B. Barkmann, Geschichte der Mongolei, Bonn 1999, p.119-122,380f, 1913, at Urga (now Ulaanbaatar).
Simplified: Tibet and Mongolia signed a treaty called the Treaty of friendship and alliance between the Government of Mongolia and Tibet  on February 2Udo B. Barkmann, Geschichte der Mongolei, Bonn 1999, p.119-122,380f, 1913, at Urga (now Ulaanbaatar).