TY - RPRT TI - Periodically varying externally imposed environmental effects on population dynamics. AU - M Ballard AU - V M Kenkre AU - M N Kuperman PY - 2004 DO - 10.1103/physreve.70.031912 UR - https://pubmed.ncbi.nlm.nih.gov/15524554/ ID - 15524554 ER -