Ka khol ma
The Ka khol ma (wyl. bka' chems ka khol ma), is a terma reveled by Atisha at the Rasa Trul Vihara (Wyl. Ra sa 'phrul). Most of the texts on Tibetan history, such as the Feast for the Learned (Wyl. mkhas pa'i dga' ston) by Lodrö Gyalpo, are based on it.
It seems there are three different versions of the text. This is not surprising for a terma, since for several generations the transmission of these texts was often given to only one person (wyl. chig rgyud). New material was added each time and it is often very difficult to find the original text.