VARIABILITY OF ALARM CALL IN GROUND SQUIRRELS OF MAJOR GROUP (RODENTIA, SCIURIDAE, SPERMOPHILUS) AS A MODEL OF GEOGRAPHIC SPECIES FORMATION Article Nikol'skii A.A., Rumyantsev V.Yu. Zoologicheskii Zhurnal. Vol. 83. 2004. P. 1008-1017
SECOND-ORDER SUFFICIENT CONDITIONS FOR INFINITE-DIMENSIONAL OPTIMIZATION PROBLEMS Article Arutyunov A.V. Doklady Mathematics. Vol. 70. 2004. P. 904-907