Authors The list of contributors in alphabetical order: Adelina Lintuluoto Agisilaos Kounelis Audrius Mecionis Clemens Lange Daan Rosendal Diego Rodriguez Domenic Gosein Elena Gazzarrini Giuseppe Steduto Marco Donadoni Marco Vidal Maria Fernando Michael Eliachevitch Parth Shandilya Rokas Maciulaitis Sinclert Perez Tibor Simko Vladyslav Moisieienkov