"heuristic approach above" . . . "Reciprocal lattice" . . . "k-space" . "lattice -space" . "Reciprocal lattice" . "reciprocal-lattice" . "reciprocal space." . "Reciprocal lattice" . "reciprocal space" . "reciprocal lattice vector" . "reciprocal lattice vectors" . "reciprocal lattice" . "wave vectors" . "reciprocal crystal lattice" . "dual lattice" . "reciprocal axes" . . "above" . . . . "mathematical description of the reciprocal lattice" .