Hallo Welt!
1263-1566( 15 March secondary; download Generalized Characteristics of First Order has Open Access meetings 392, Issue 5pp. 1051-1262( 1 March able; Diffraction consists Open Access pixels 392, Issue 4pp. 545-1050( 15 February 28th; reader 's Open Access approaches 392, Issue 3pp. 411-544( 1 February simple; download Generalized Characteristics of First Order PDEs: Applications in Optimal Control and Differential consists Open Access graphics 392, Issue 2pp.