by R. Freiwillig ... [et al.]. by R. Glasfeld ... [et al.] by Rune Elvik ... [et al.]. Jan R. Williams ... et al. by I.C. Taig ... [et al.] by Raphael Finkel ... [et al.] by Roberto Serra ... [et al.]. by James J. Freeland ... [et al.]. by R.L. Skovholt ... [et al.] by James J. Freeland ... [et al.]