Scott A. Heppell Heppell, S. A., & Sullivan, C. V. (2000). Identification of gender and reproductive maturity in the absence of gonads: muscle tissue levels of sex steroids and vitellogenin in gag (Mycteroperca microlepis). Canadian Journal of Fisheries and Aquatic Sciences, 57(1), 148–159. https://doi.org/10.1139/f99-188 Heppell, S. A., Jackson, L. F., Weber, G. M., & Sullivan, C. V. (1999). Enzyme-linked immunosorbent assay (ELISA) of vitellogenin in temperate basses (Genus Morone): Plasma and in vitro analyses. TRANSACTIONS OF THE AMERICAN FISHERIES SOCIETY, 128(3), 532–541. https://doi.org/10.1577/1548-8659(1999)128<0532:ELIAEO>2.0.CO;2 Parks, L. G., Cheek, A. O., Denslow, N. D., Heppell, S. A., McLachlan, J. A., LeBlanc, G. A., & Sullivan, C. V. (1999). Fathead minnow (Pimephales promelas) vitellogenin: purification, characterization and quantitative immunoassay for the detection of estrogenic compounds. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY, 123(2), 113–125. https://doi.org/10.1016/s0742-8413(99)00010-9 Heppell, S. A., & Sullivan, C. V. (1999). Gag (Mycteroperca microlepis) vitellogenin: purification, characterization and use for enzyme-linked immunosorbent assay (ELISA) of female maturity in three species of grouper. FISH PHYSIOLOGY AND BIOCHEMISTRY, 20(4), 361–374. https://doi.org/10.1023/A:1007730816797 HEPPELL, S. S., WALTERS, JR, & CROWDER, L. B. (1994). EVALUATING MANAGEMENT ALTERNATIVES FOR RED-COCKADED WOODPECKERS - A MODELING APPROACH. JOURNAL OF WILDLIFE MANAGEMENT, 58(3), 479–487. https://doi.org/10.2307/3809319