writing stuff on paper like they did in the middle ages

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Student = notes + tea/coffee + "where the f**k is my free time?"
According to the definition in (Haus & Rodriguez, 1993), a music object may be anything that could have a music meaning and that could be thought as an entity, either simple or complex, either abstract or detailed. Such entity will present some relationship with other music objects. In a Music Petri Net, when a place containing an object receives a token, the music object is executed, i.e. played.
Music Description and Processing: An Approach Based on Petri Nets and XML | InTechOpen
A Primer in Petri Net Design (Springer Compass International)
A Primer in Petri Net Design (Springer Compass International) Petri nets provide a formal framework for system modeling and validation which has proven to be very reliable in practice. This book presents various net models appropriate for designing specific systems, where systems are understood very generally as "organizational systems" in which regulated flows of objects and information are significant. The models are interrelated in the sense that they have common interpretation patterns: together they can be understood as a method for specifying any given system or any section of such a system to any given degree of refinement. The simple and immediately understandable principles of system modelling with nets makes it possible to provide an illustrated description of this method without going into the mathematics behind it. The text is based on courses the author developed for project engineers and project managers in the area of embedded computer systems.