1. For a complete review of both theoretical and experimental work on Kℓ3 decay seeM. K. Gaillard andL. M. Chounet: CERN report 70-14 (1970), unpublished;
2. A. A. Golestaneh: Center for Particle Theory (Austin) preprint CPT 173 (1973).
3. Ahmed Ali, Faheem Hussain andM. S. K. Razmi: ICTP preprint IC/72/91 (1972).
4. G. Furlan andN. Paver:Nuovo Cimento,11 A, 543 (1972).
5. S. Danskin:Phys. Rev. D,6, 2062 (1972).