This spelling was established by the linguists Matthias de Vries and L.A. te Winkel. In 1863 Te Winkel published the results in "De grondbeginselen der Nederlandsche spelling. Ontwerp der spelling voor het aanstaande Nederlandsch Woordenboek" (The foundations of Dutch spelling. Project for the spelling of the forthcoming Dutch Dictionary). The spelling of De Vries and Te Winkel combined elements of the three current systems, providing a much needed solution to the chaos. By 21 November, the decision was accepted by a royal decree in Belgium. In 1866 De Vries and Te Winkel produced "Woordenlijst voor de spelling der Nederlandsche taal" (Vocabulary for the spelling of the Dutch language), which can be seen as a precursor of today's Groene Boekje (Green Booklet).