This was the assumption made in glottochronology. The published papers give an idea of the views on glottochronology at that time. Possible solutions for Glottochronology are forthcoming due to computational phylogenetic methods. Glottochronology itself dates back to the mid-20th century. Earlier methods, such as lexicostatistics and glottochronology, have been proven to be premature and inaccurate. Glottochronology enables absolute dates to be estimated. Glottochronology studies suggest the split occurred between about 1,500 and 1,800 B.C. The approach of Gray and Atkinson, as they state, has nothing to do with "glottochronology". Glottochronology studies suggest the split occurred between about 1,500 and 1,800 BCE. Glottochronology has met with mounting scepticism, and is seldom applied today.