Normal order
Top View
					- The Klein-Gordon Equation (12) As the Basic Field Equation of the Scalar Field
 - Quantum Energy Teleportation: an Introductory Review
 - 2. Free Fields
 - Arxiv:Hep-Ph/9601268V1 15 Jan 1996
 - Zero-Point Energy and Casimir-Effect
 - 1. Introduction
 - Notes on the Kinetic Limit for Weakly Interacting Quantum Fluids
 - Combinatorics and Boson Normal Ordering: a Gentle Introduction