ON THE EXISTENCE, MULTIPLICITY, AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF SYSTEMS OF SECOND ORDER DIFFERENTIAL EQUATIONS Vol. 2(1) Jan 2014, No. 7, pp. 72-84 LI HONG BAI

(2014). ON THE EXISTENCE, MULTIPLICITY, AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF SYSTEMS OF SECOND ORDER DIFFERENTIAL EQUATIONS Vol. 2(1) Jan 2014, No. 7, pp. 72-84 LI HONG BAI. Electronic Journal of Mathematical Analysis and Applications, 2(1), -. doi: 10.21608/ejmaa.2014.309824

. "ON THE EXISTENCE, MULTIPLICITY, AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF SYSTEMS OF SECOND ORDER DIFFERENTIAL EQUATIONS Vol. 2(1) Jan 2014, No. 7, pp. 72-84 LI HONG BAI", Electronic Journal of Mathematical Analysis and Applications, 2, 1, 2014, -. doi: 10.21608/ejmaa.2014.309824

(2014). 'ON THE EXISTENCE, MULTIPLICITY, AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF SYSTEMS OF SECOND ORDER DIFFERENTIAL EQUATIONS Vol. 2(1) Jan 2014, No. 7, pp. 72-84 LI HONG BAI', Electronic Journal of Mathematical Analysis and Applications, 2(1), pp. -. doi: 10.21608/ejmaa.2014.309824

ON THE EXISTENCE, MULTIPLICITY, AND NONEXISTENCE OF POSITIVE PERIODIC SOLUTIONS OF SYSTEMS OF SECOND ORDER DIFFERENTIAL EQUATIONS Vol. 2(1) Jan 2014, No. 7, pp. 72-84 LI HONG BAI. Electronic Journal of Mathematical Analysis and Applications, 2014; 2(1): -. doi: 10.21608/ejmaa.2014.309824