TY - JOUR TI - Zprávy JO - Applications of Mathematics PY - 1964 SP - 238 VL - 9 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.21136/AM.1964.102901/ DO - 10.21136/AM.1964.102901 LA - cs ID - 10_21136_AM_1964_102901 ER -