The convincing evidence which was to overturn this view became known only after Morley's death, starting with Yuri Knorozov's work in the 1950s. Over the next decades other Mayanists such as Proskouriakoff, Michael D. Coe, and David H. Kelley would further expand upon this phonetic line of enquiry, which ran counter to the accepted view but would prove to be ever more fruitful as their work continued. By the mid-1970s, it had become increasingly clear to most that the Maya writing system was a logosyllabic one, a mixture of logograms and phonetic components that included a fully functional syllabary.