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These notes were written for a set of three lectures given in a school at theMax Planck Institute for the Physics of Complex Systems in October/2017 beforethe workshop "Critical Stability of Quantum Few-Body Systems". These lecturesare primarily dedicated to the students and represent a very idiosyncraticvision of the author, mainly in the last part of the text related toapplications. These notes are only a tentative to show a technique, among manyothers, to solve problems in a very rich area of the contemporary physics - theFew-Body Physics - many times unknown by a considerable part of the students.

Few-body techniques using momentum space for bound and continuum states