There is no critical edition, and the only version available for the general reader is the modernized and abridged text published by Paulin Paris in vols.
This only begins with what Paulin Paris terms the Agravain section, all the part previous to Guenevere's rescue from Meleagant having been lost; but the text is an excellent one, agreeing closely with the Lenoire edition of 1533.
Here he was influenced, as to biblical languages and textual criticism, by the learned and loyal-minded Abbe Paulin Martin, and as to a vivid consciousness of the true nature, gravity and urgency of the biblical problems and an Attic sense of form by the historical intuition and the mordant irony of Abbe Louis Duchesne.
7, a text which, in the wake of a line of scholars from Erasmus downwards, Abbe Paulin Martin had, in 1887, exhaustively shown to be no older than the end of the 4th century A.D.
Hucher, Le Grand Saint Graal; Paulin Paris, Romans de la Table Ronde; Alfred Nutt, Studies in the Legend of the Holy Grail.