@article{RSMUP_1981__64__1_0, author = {Vatsala, A. S. and Vaughn, R. L.}, title = {Existence of extremal solutions and comparison results for delay differential equations in abstract cones}, journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova}, publisher = {Seminario Matematico of the University of Padua}, volume = {64}, year = {1981}, pages = {1-14}, zbl = {0507.34063}, mrnumber = {636622}, language = {en}, url = {http://www.numdam.org/item/RSMUP_1981__64__1_0} }

Vatsala, A. S.; Vaughn, R. L. Existence of extremal solutions and comparison results for delay differential equations in abstract cones. Rendiconti del Seminario Matematico della Università di Padova, Volume 64 (1981) , pp. 1-14. http://www.numdam.org/item/RSMUP_1981__64__1_0/

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