TY - JOUR TI - Recense JO - Applications of Mathematics PY - 1968 SP - 421 EP - 428 VL - 13 IS - 5 UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1968.103189/ DO - 10.21136/AM.1968.103189 LA - cs ID - 10_21136_AM_1968_103189 ER -