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11 P ET ROVA Z A O sciLlatiolls of a class of equations and inequalities of fourth

order Mathematics and Math ematical Education 5MB 35 (2006) 195- 200

12 P ETROVA Z A 0 cillations of cer tain fourth order charact cristic ini lial value

problems in Applications of Math ematics in Engineering fj Economics edited by 1

S M arinov and M D Todorov Proc 32nd International Conference MEE Softtr ade

Sofia (2007) 41-46

13 PETROV Z A Oscillations of som e equations and inequali ties of second

order and applications in m echanics iu Applications oj Mathematics in Engineering

fj Economics edited by M D Todorov Proc 33rd International Confer cnce AlvIEE

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104 PET ROVA Z A G alerkin s m ethod and distributions of zeros of som gt equations

from the m echan ics I in Applications of Mathematics in Engineering fj Econumics

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15 PETROVA Z A Galerkins method and distributions of z ros of some equations

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dited by G Venkov R Kovach va and Pashev Proc 35th Internat ional Conference

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16 P ETROVA Z A Oscillation properties of the equat ion of Boussinesq and

comparison with oth r fourth order equations in Application of Mathematics in 1i chnical

and Natural Sciences edited by M D Todorov and C 1 Chri tOY Pro International

Conference AMiTaNS 09 AIP CP1186 Melville New York (2009) 292- 299

I7 PETROVA Z A Com arison results for some equat ions und r veral boundary

onditi ns 1 in Applications of Mathematics in Engineering fj Econumics edit d by

G V nkov R Kovacheva nd V Pasheva Proc 36th International Conference AMEE

AIP CP1293 ielvil1e New York (2010) 123- 13Cl

18 P ETROVA Z A Comparison results for some equation under several boundary

conditions II in Applications of Mathematics in Engincering fj Economics edilcd by

G Venkov R Kovacheva and V Pasheva Proc 37th International Conference AM E

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19 P ETRO A Z A Oscillations of generalized Timoshenko beam cquat i ns

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