found: Work cat.: Steinkopf, O. Anleitung für das Musizieren auf Pommern ... c1978.
found: New Grove dictionary of musical instruments(Racket (Rackett), cervelas, cervelat, rackett, rankett, cortalli, cortaldi)
found: New Grove Online, April 29, 2013:racket (double-reed woodwind instrument of the Renaissance and Baroque periods. The Renaissance or ‘pirouette’ type, though never in widespread use, appeared sporadically in central Europe from about the middle of the 16th century to the middle of the 17th.(
