Muller H.F. A Chronology of Vulgar Latin

De Gruyter, 1929. — 184 p. — (Beihefte zur Zeitschrift für romanische Philologie 78).Philologists have more or less consciously held to the opinion that the transition from Latin to Romance must have been a very gradual one. As documents do not show anything of the kind, but are, in the earlier period, of a Latin character with isolated Romance- like features, then later Romance with isolated Latin-like features, it has been universally assumed that the former did not represent the reality; that the gradual evolution took place in the oral tongue without leaving any but scattered vestiges in the writings of the time.