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一种网上支付方式，可以付钱给任何有email的人，主要用于个人之间的网上交易。 www.paypal.com；

Umkehr der Durchsetzungslast beim PayPal-K?uferschutz
PayPal processed $132 billion in Q1 growth tear
PayPal and eBay finalize new agreement
Maximum Likelihood from Incomplete Data via the EM Algorithm
Journal of the American Statistical Association
Sample Selection Bias as a Specification Error
Journal of Marketing Research
A Contribution to the Theory of Economic Growth
Social Network Analysis: Methods and Applications by Stanley Wasserman; Katherine Faust
Mineral Nutrition of Higher Plants by Horst Marschner