机译:一阶积分微分方程周期边值问题的存在性
School;
of;
Math.;
and;
Physics,;
China;
University;
of;
Geosciences,;
Wuhan,;
430074;
Dept.;
of;
Math,;
and;
Physics,;
Hubei;
University;
of;
Technology,;
Wuhan,;
430068;
School;
of;
Math.;
and;
Computer;
Science,;
Guizhou;
Normal;
University,;
Guiyang;
550001;