12th International young physicists tournament, May 23-29, 1999 : reports of Georgian team / [A. Ashadze, G. Bashiashvili, T. Bibilashvili et al. ; ed. G. Laskhishvili. - Tb. : Polygraphic lab. of the sci.-techn. centre of students a. youth of Georgia, 1999]. - ii, 76 p. : fig. ; 29 cm.см.[MFN: 191921]