We are currently working on this
Following the publication of a comprehensive work on learning and practising arm vibrato [ISBN 978-3-00-068280-3], we are working on an overview that will provide brief and compact guidance on which exercises can be used to remedy which problems. It is expected to be ready in May 2022.
Rhythm learning can be directly linked to complex instrumental technical challenges. We are currently working out how to effectively link rhythm practice/learning with the playing techniques of the high strings. A first comprehensive contribution is contained in the booklet "Pizzicato World". Now we are working on ideas for the piano.