TY - JOUR TI - News and Notices JO - Applications of Mathematics PY - 1986 VL - 31 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1986.104218/ DO - 10.21136/AM.1986.104218 LA - en ID - 10_21136_AM_1986_104218 ER -