When is the first eigenfunction for the clamped plate equation of fixed sign?

Sweers, Guido. "When is the first eigenfunction for the clamped plate equation of fixed sign?." Electronic Journal of Differential Equations (EJDE) [electronic only] 2001 (2001): 285-296. <http://eudml.org/doc/121016>.

@article{Sweers2001,
author = {Sweers, Guido},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
keywords = {maximum principle; biharmonic},
language = {eng},
pages = {285-296},
publisher = {Southwest Texas State University, Department of Mathematics, San Marcos, TX; North Texas State University, Department of Mathematics, Denton},
title = {When is the first eigenfunction for the clamped plate equation of fixed sign?},
url = {http://eudml.org/doc/121016},
volume = {2001},
year = {2001},
}

TY - JOUR
AU - Sweers, Guido
TI - When is the first eigenfunction for the clamped plate equation of fixed sign?
JO - Electronic Journal of Differential Equations (EJDE) [electronic only]
PY - 2001
PB - Southwest Texas State University, Department of Mathematics, San Marcos, TX; North Texas State University, Department of Mathematics, Denton
VL - 2001
SP - 285
EP - 296
LA - eng
KW - maximum principle; biharmonic
UR - http://eudml.org/doc/121016
ER -