TY - JOUR TI - Recense JO - Applications of Mathematics PY - 1970 SP - 465 EP - 475 VL - 15 IS - 6 UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1970.103317/ DO - 10.21136/AM.1970.103317 LA - cs ID - 10_21136_AM_1970_103317 ER -