00290nam a2200109 a 450000500170000008200180001710000170003524500440005226000380009630000270013450000190016120251203091557.0  a577.0724bMAC  aMacDonald, N  aTrees and networks in biological models  aNew YorkbJohn Wiley & Sonsc1983  aviii,215p.c23 cm.bHB  aincludes index